diff --git a/3rdParty/Storm/Source/storm.cpp b/3rdParty/Storm/Source/storm.cpp
index ceccb9aef..c09968d57 100644
--- a/3rdParty/Storm/Source/storm.cpp
+++ b/3rdParty/Storm/Source/storm.cpp
@@ -5,7 +5,7 @@
 #define rVoid { return; }
 #define rInt { return 0; }
 
-BOOL STORMAPI SNetCreateGame(const char *pszGameName, const char *pszGamePassword, const char *pszGameStatString, DWORD dwGameType, char *GameTemplateData, int GameTemplateSize, int playerCount, char *creatorName, char *a11, int *playerID) rBool;
+BOOL STORMAPI SNetCreateGame(const char *pszGameName, const char *pszGamePassword, const char *pszGameStatString, DWORD dwGameType, char *GameTemplateData, int GameTemplateSize, int playerCount, const char *creatorName, const char *a11, int *playerID) rBool;
 BOOL STORMAPI SNetDestroy() rBool;
 
 BOOL STORMAPI SNetDropPlayer(int playerid, DWORD flags) rBool;
@@ -134,11 +134,11 @@ BOOL STORMAPI SGdiSetPitch(int pitch) rBool;
 
 BOOL STORMAPI Ordinal393(char *string, int, int) rBool;
 
-void *STORMAPI SMemAlloc(size_t amount, char *logfilename, int logline, int defaultValue) rPVoid;
+void *STORMAPI SMemAlloc(size_t amount, const char *logfilename, int logline, int defaultValue) rPVoid;
 
-BOOL STORMAPI SMemFree(void *location, char *logfilename, int logline, char defaultValue) rBool;
+BOOL STORMAPI SMemFree(void *location, const char *logfilename, int logline, char defaultValue) rBool;
 
-void* STORMAPI SMemReAlloc(void *location, size_t amount, char *logfilename, int logline, char defaultValue) rPVoid;
+void* STORMAPI SMemReAlloc(void *location, size_t amount, const char *logfilename, int logline, char defaultValue) rPVoid;
 
 BOOL STORMAPI SRegLoadData(const char *keyname, const char *valuename, int size, LPBYTE lpData, BYTE flags, LPDWORD lpcbData) rBool;
 BOOL STORMAPI SRegLoadString(const char *keyname, const char *valuename, BYTE flags, char *buffer, size_t buffersize) rBool;
@@ -169,7 +169,7 @@ BOOL STORMAPI STransCreateI(void *pBuffer, int width, int height, int bpp, int a
 BOOL STORMAPI SVidDestroy() rBool;
 BOOL STORMAPI SVidGetSize(HANDLE video, int width, int height, int zero) rBool;
 BOOL STORMAPI SVidInitialize(HANDLE video) rBool;
-BOOL STORMAPI SVidPlayBegin(char *filename, int a2, int a3, int a4, int a5, int flags, HANDLE *video) rBool;
+BOOL STORMAPI SVidPlayBegin(const char *filename, int a2, int a3, int a4, int a5, int flags, HANDLE *video) rBool;
 
 BOOL STORMAPI SVidPlayContinueSingle(HANDLE video, int a2, int a3) rBool;
 BOOL STORMAPI SVidPlayEnd(HANDLE video) rBool;
@@ -224,7 +224,7 @@ int STORMAPI SBigPowMod(void *buffer1, void *buffer2, int a3, int a4) rInt;
 int STORMAPI SBigToBinaryBuffer(void *buffer, int length, int a3, int a4) rInt;
 //
 
-void __stdcall SDrawMessageBox(char *,char *,int) rVoid;
+void __stdcall SDrawMessageBox(const char *,const char *,int) rVoid;
 void __cdecl SDrawDestroy(void) rVoid;
 BOOLEAN __cdecl StormDestroy(void) rBool;
 BOOL __stdcall SFileSetBasePath(char *) rBool;
diff --git a/3rdParty/Storm/Source/storm.h b/3rdParty/Storm/Source/storm.h
index ef2a6cc54..d3d3e5eac 100644
--- a/3rdParty/Storm/Source/storm.h
+++ b/3rdParty/Storm/Source/storm.h
@@ -97,7 +97,7 @@ struct CCritSect {
 extern "C" {
 #endif
 
-BOOL STORMAPI SNetCreateGame(const char *pszGameName, const char *pszGamePassword, const char *pszGameStatString, DWORD dwGameType, char *GameTemplateData, int GameTemplateSize, int playerCount, char *creatorName, char *a11, int *playerID);
+BOOL STORMAPI SNetCreateGame(const char *pszGameName, const char *pszGamePassword, const char *pszGameStatString, DWORD dwGameType, char *GameTemplateData, int GameTemplateSize, int playerCount, const char *creatorName, const char *a11, int *playerID);
 BOOL STORMAPI SNetDestroy();
 
 /*  SNetDropPlayer @ 106
@@ -828,7 +828,7 @@ void *
     STORMAPI
     SMemAlloc(
         unsigned int amount,
-        char *logfilename,
+        const char *logfilename,
         int logline,
         int defaultValue);
 
@@ -851,7 +851,7 @@ BOOL
 STORMAPI
 SMemFree(
     void *location,
-    char *logfilename,
+    const char *logfilename,
     int  logline,
     char defaultValue);
 
@@ -878,7 +878,7 @@ STORMAPI
 SMemReAlloc(
     void    *location,
     unsigned int  amount,
-    char    *logfilename,
+    const char *logfilename,
     int     logline,
     char    defaultValue);
 
@@ -932,7 +932,7 @@ BOOL STORMAPI STransCreateI(void *pBuffer, int width, int height, int bpp, int a
 BOOL STORMAPI SVidDestroy();
 BOOL STORMAPI SVidGetSize(HANDLE video, int width, int height, int zero);
 BOOL STORMAPI SVidInitialize(HANDLE video);
-BOOL STORMAPI SVidPlayBegin(char *filename, int a2, int a3, int a4, int a5, int flags, HANDLE *video);
+BOOL STORMAPI SVidPlayBegin(const char *filename, int a2, int a3, int a4, int a5, int flags, HANDLE *video);
 
 BOOL STORMAPI SVidPlayContinueSingle(HANDLE video, int a2, int a3);
 BOOL STORMAPI SVidPlayEnd(HANDLE video);
@@ -1320,7 +1320,7 @@ int STORMAPI SBigPowMod(void *buffer1, void *buffer2, int a3, int a4);
 
 int STORMAPI SBigToBinaryBuffer(void *buffer, int length, int a3, int a4);
 
-void __stdcall SDrawMessageBox(char *,char *,int);
+void __stdcall SDrawMessageBox(const char *,const char *,int);
 void __cdecl SDrawDestroy(void);
 BOOLEAN __cdecl StormDestroy(void);
 BOOL __stdcall SFileSetBasePath(char *);
diff --git a/DiabloUI/_temp_data.cpp b/DiabloUI/_temp_data.cpp
index 493fb0a5b..ec19de342 100644
--- a/DiabloUI/_temp_data.cpp
+++ b/DiabloUI/_temp_data.cpp
@@ -369,4 +369,4 @@ HANDLE titlePHTrans[30];
 int Title_cpp_float;    // weak
 int titleTransIdx;      // weak
 int titlesnd_cpp_float; // weak
-void(__stdcall *gfnSoundFunction)(char *file);
+void(__stdcall *gfnSoundFunction)(const char *file);
diff --git a/DiabloUI/_temp_funcs.h b/DiabloUI/_temp_funcs.h
index 17e057d2b..47120d07c 100644
--- a/DiabloUI/_temp_funcs.h
+++ b/DiabloUI/_temp_funcs.h
@@ -423,10 +423,10 @@ void __cdecl SelHero_cpp_init();
 void __fastcall SelHero_SetStaticBMP(HWND hWnd, int adjust_size);
 void __fastcall SelHero_PrintHeroInfo(HWND hWnd, _uiheroinfo *pInfo);
 void __fastcall SelHero_SetStringWithMsg(HWND hWnd, const char *str);
-BOOL __fastcall SelHero_IsNameReserved(char *name);
+BOOL __fastcall SelHero_IsNameReserved(const char *name);
 void __fastcall SelHero_SetLastNamePos(char *name);
-BOOL __fastcall SelHero_NameHasChar(char *name, char *illegalchrs);
-BOOL __fastcall UiValidPlayerName(char *name);
+BOOL __fastcall SelHero_NameHasChar(const char *name, char *illegalchrs);
+BOOL __fastcall UiValidPlayerName(const char *name);
 BOOL __stdcall UiSelHeroMultDialog(BOOL(__stdcall *fninfo)(BOOL(__stdcall *fninfofunc)(_uiheroinfo *)), BOOL(__stdcall *fncreate)(_uiheroinfo *), BOOL(__stdcall *fnremove)(_uiheroinfo *), BOOL(__stdcall *fnstats)(int, _uidefaultstats *), int *dlgresult, int *a6, char *name);
 LRESULT __stdcall SelHero_WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
 void __fastcall SelHero_DoStuffWithStrings(HWND hWnd);
@@ -595,7 +595,7 @@ void __fastcall Title_KillTimerAndFree(HWND hWnd);
 void __fastcall Title_LoadAllTitleImgs(HWND hWnd, int time);
 void __fastcall Title_KillAndFadeDlg(HWND hWnd);
 
-void __fastcall TitleSnd_SetSoundFunction(void(__stdcall *func)(char *file));
+void __fastcall TitleSnd_SetSoundFunction(void(__stdcall *func)(const char *file));
 void __cdecl TitleSnd_InitSoundFunc();
 void __cdecl TitleSnd_PlayMoveSound();
 void __cdecl TitleSnd_PlaySelectSound();
diff --git a/DiabloUI/diabloui.h b/DiabloUI/diabloui.h
index 4e93c7442..e33eb3b52 100644
--- a/DiabloUI/diabloui.h
+++ b/DiabloUI/diabloui.h
@@ -13,7 +13,7 @@ struct FontStruct {
 };
 
 struct ProfileStruct {
-	char *name;
+	const char *name;
 	char field_4;
 	int msg;
 	int field_C;
@@ -21,7 +21,7 @@ struct ProfileStruct {
 
 struct ProfFntStruct {
 	int size;
-	char *fontname;
+	const char *fontname;
 	int field_8;
 };
 
@@ -31,12 +31,12 @@ void __stdcall UiSetSpawned(BOOL bSpawned);
 void __stdcall UiInitialize();
 BOOL __stdcall UiCopyProtError(int *pdwResult);
 void __stdcall UiAppActivate(BOOL bActive);
-BOOL __fastcall UiValidPlayerName(char *name); /* check __stdcall */
+BOOL __fastcall UiValidPlayerName(const char *name); /* check __stdcall */
 BOOL __stdcall UiSelHeroMultDialog(BOOL(__stdcall *fninfo)(BOOL(__stdcall *fninfofunc)(_uiheroinfo *)), BOOL(__stdcall *fncreate)(_uiheroinfo *), BOOL(__stdcall *fnremove)(_uiheroinfo *), BOOL(__stdcall *fnstats)(unsigned int, _uidefaultstats *), int *dlgresult, BOOL *hero_is_created, char *name);
 BOOL __stdcall UiSelHeroSingDialog(BOOL(__stdcall *fninfo)(BOOL(__stdcall *fninfofunc)(_uiheroinfo *)), BOOL(__stdcall *fncreate)(_uiheroinfo *), BOOL(__stdcall *fnremove)(_uiheroinfo *), BOOL(__stdcall *fnstats)(unsigned int, _uidefaultstats *), int *dlgresult, char *name, int *difficulty);
 BOOL __stdcall UiCreditsDialog(int a1);
-BOOL __stdcall UiMainMenuDialog(char *name, int *pdwResult, void(__stdcall *fnSound)(char *file), int attractTimeOut);
-BOOL __stdcall UiProgressDialog(HWND window, char *msg, int enable, int(*fnfunc)(), int rate);
+BOOL __stdcall UiMainMenuDialog(const char *name, int *pdwResult, void(__stdcall *fnSound)(const char *file), int attractTimeOut);
+BOOL __stdcall UiProgressDialog(HWND window, const char *msg, int enable, int(*fnfunc)(), int rate);
 const char **__stdcall UiProfileGetString();
 void __cdecl UiProfileCallback();
 void __cdecl UiProfileDraw();
diff --git a/DiabloUI/mainmenu.cpp b/DiabloUI/mainmenu.cpp
index 64d32021a..aeea8fec1 100644
--- a/DiabloUI/mainmenu.cpp
+++ b/DiabloUI/mainmenu.cpp
@@ -7,7 +7,7 @@ void __cdecl MainMenu_cpp_init()
 // 1002A0D4: using guessed type int mainmenu_cpp_float;
 
 // ref: 0x1000816F
-BOOL __stdcall UiMainMenuDialog(char *name, int *pdwResult, void(__stdcall *fnSound)(char *file), int attractTimeOut)
+BOOL __stdcall UiMainMenuDialog(const char *name, int *pdwResult, void(__stdcall *fnSound)(const char *file), int attractTimeOut)
 {
 	int v4; // eax
 	int v5; // esi
diff --git a/DiabloUI/progress.cpp b/DiabloUI/progress.cpp
index bf74670a9..949bc0671 100644
--- a/DiabloUI/progress.cpp
+++ b/DiabloUI/progress.cpp
@@ -10,7 +10,7 @@ signed int Progress_10009480() { return 0; }
 // 1002A2EC: using guessed type int dword_1002A2EC;
 
 // ref: 0x1000948B
-BOOL __stdcall UiProgressDialog(HWND window, char *msg, int enable, int(*fnfunc)(), int rate) { return 0; }
+BOOL __stdcall UiProgressDialog(HWND window, const char *msg, int enable, int(*fnfunc)(), int rate) { return 0; }
 /* {
 	HWND v5; // eax
 	BOOL result; // eax
diff --git a/DiabloUI/selhero.cpp b/DiabloUI/selhero.cpp
index 2fc330b38..2a3df1824 100644
--- a/DiabloUI/selhero.cpp
+++ b/DiabloUI/selhero.cpp
@@ -151,7 +151,7 @@ void __fastcall SelHero_SetStringWithMsg(HWND hWnd, const char *str)
 }
 
 // ref: 0x1000BAB4
-BOOL __fastcall SelHero_IsNameReserved(char *name)
+BOOL __fastcall SelHero_IsNameReserved(const char *name)
 {
 	UINT v1;          // esi
 	BOOL result;      // eax
@@ -182,7 +182,7 @@ void __fastcall SelHero_SetLastNamePos(char *name)
 }
 
 // ref: 0x1000BB34
-BOOL __fastcall SelHero_NameHasChar(char *name, char *illegalchrs)
+BOOL __fastcall SelHero_NameHasChar(const char *name, char *illegalchrs)
 {
 	char v5; // al
 
@@ -200,7 +200,7 @@ BOOL __fastcall SelHero_NameHasChar(char *name, char *illegalchrs)
 }
 
 // ref: 0x1000BB75
-BOOL __fastcall UiValidPlayerName(char *name)
+BOOL __fastcall UiValidPlayerName(const char *name)
 {
 	BOOL v2; // edi
 
diff --git a/DiabloUI/titlesnd.cpp b/DiabloUI/titlesnd.cpp
index 9388e86cb..f4c245238 100644
--- a/DiabloUI/titlesnd.cpp
+++ b/DiabloUI/titlesnd.cpp
@@ -1,5 +1,5 @@
 // ref: 0x10010306
-void __fastcall TitleSnd_SetSoundFunction(void(__stdcall *func)(char *file))
+void __fastcall TitleSnd_SetSoundFunction(void(__stdcall *func)(const char *file))
 {
 	gfnSoundFunction = func;
 }
diff --git a/Makefile b/Makefile
index fee594b36..63ca8e9e2 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ endif
 #     static_cast<NEW_TYPE>(reinterpret_cast<uintptr_t>(ptr))
 # instead of
 #     (NEW_TYPE)(ptr)
-CXXFLAGS=-fpermissive -Wno-write-strings
+CXXFLAGS=-fpermissive
 CPPFLAGS=-MMD -MF $*.d
 LDLIBS=-lgdi32 -lversion -ldiabloui -lstorm
 LDFLAGS=-L./ -static-libgcc -mwindows
diff --git a/Source/appfat.cpp b/Source/appfat.cpp
index c0a193e45..6b7e21276 100644
--- a/Source/appfat.cpp
+++ b/Source/appfat.cpp
@@ -542,7 +542,7 @@ void FreeDlg()
  * @param pszFmt Error message format
  * @param ... Additional parameters for message format
  */
-void __cdecl DrawDlg(char *pszFmt, ...)
+void __cdecl DrawDlg(const char *pszFmt, ...)
 {
 	char text[256];
 	va_list arglist;
@@ -569,7 +569,7 @@ void assert_fail(int nLineNo, const char *pszFile, const char *pszFail)
 /**
  * @brief Terminates the game with a DirectDraw assertion message box.
  */
-void DDErrMsg(DWORD error_code, int log_line_nr, char *log_file_path)
+void DDErrMsg(DWORD error_code, int log_line_nr, const char *log_file_path)
 {
 	char *msg;
 
@@ -582,7 +582,7 @@ void DDErrMsg(DWORD error_code, int log_line_nr, char *log_file_path)
 /**
  * @brief Terminates the game with a DirectSound assertion message box.
  */
-void DSErrMsg(DWORD error_code, int log_line_nr, char *log_file_path)
+void DSErrMsg(DWORD error_code, int log_line_nr, const char *log_file_path)
 {
 	char *msg;
 
@@ -641,9 +641,9 @@ static BOOL CALLBACK FuncDlg(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
 /**
  * @brief Terminates the game and displays an error dialog box based on the given dialog_id.
  */
-void ErrDlg(int dialog_id, DWORD error_code, char *log_file_path, int log_line_nr)
+void ErrDlg(int dialog_id, DWORD error_code, const char *log_file_path, int log_line_nr)
 {
-	char *size;
+	const char *size;
 	LPARAM dwInitParam[128];
 
 	FreeDlg();
@@ -662,7 +662,7 @@ void ErrDlg(int dialog_id, DWORD error_code, char *log_file_path, int log_line_n
 /**
  * @brief Sets the text of the given dialog.
  */
-static void TextDlg(HWND hDlg, char *text)
+static void TextDlg(HWND hDlg, const char *text)
 {
 	center_window(hDlg);
 
@@ -673,9 +673,9 @@ static void TextDlg(HWND hDlg, char *text)
 /**
  * @brief Displays a warning dialog box based on the given dialog_id and error code.
  */
-void ErrOkDlg(int dialog_id, DWORD error_code, char *log_file_path, int log_line_nr)
+void ErrOkDlg(int dialog_id, DWORD error_code, const char *log_file_path, int log_line_nr)
 {
-	char *size;
+	const char *size;
 	LPARAM dwInitParam[128];
 
 	size = strrchr(log_file_path, '\\');
@@ -705,7 +705,7 @@ void FileErrDlg(const char *error)
 /**
  * @brief Terminates the game with an out of disk space error dialog.
  */
-void DiskFreeDlg(char *error)
+void DiskFreeDlg(const char *error)
 {
 	FreeDlg();
 
@@ -736,7 +736,7 @@ BOOL InsertCDDlg()
 /**
  * @brief Terminates the game with a read-only directory error dialog.
  */
-void DirErrorDlg(char *error)
+void DirErrorDlg(const char *error)
 {
 	FreeDlg();
 
diff --git a/Source/appfat.h b/Source/appfat.h
index ab2154f09..2b1daa3a9 100644
--- a/Source/appfat.h
+++ b/Source/appfat.h
@@ -21,19 +21,19 @@ char *TraceLastError();
 void __cdecl app_fatal(const char *pszFmt, ...);
 void MsgBox(const char *pszFmt, va_list va);
 void FreeDlg();
-void __cdecl DrawDlg(char *pszFmt, ...);
+void __cdecl DrawDlg(const char *pszFmt, ...);
 #ifdef _DEBUG
 void assert_fail(int nLineNo, const char *pszFile, const char *pszFail);
 #endif
-void DDErrMsg(DWORD error_code, int log_line_nr, char *log_file_path);
-void DSErrMsg(DWORD error_code, int log_line_nr, char *log_file_path);
+void DDErrMsg(DWORD error_code, int log_line_nr, const char *log_file_path);
+void DSErrMsg(DWORD error_code, int log_line_nr, const char *log_file_path);
 void center_window(HWND hDlg);
-void ErrDlg(int template_id, DWORD error_code, char *log_file_path, int log_line_nr);
-void TextDlg(HWND hDlg, char *text);
-void ErrOkDlg(int template_id, DWORD error_code, char *log_file_path, int log_line_nr);
+void ErrDlg(int template_id, DWORD error_code, const char *log_file_path, int log_line_nr);
+void TextDlg(HWND hDlg, const char *text);
+void ErrOkDlg(int template_id, DWORD error_code, const char *log_file_path, int log_line_nr);
 void FileErrDlg(const char *error);
-void DiskFreeDlg(char *error);
+void DiskFreeDlg(const char *error);
 BOOL InsertCDDlg();
-void DirErrorDlg(char *error);
+void DirErrorDlg(const char *error);
 
 #endif /* __APPFAT_H__ */
diff --git a/Source/control.cpp b/Source/control.cpp
index 71880bd11..74a42e1fe 100644
--- a/Source/control.cpp
+++ b/Source/control.cpp
@@ -233,9 +233,9 @@ int PanBtnPos[8][5] = {
 	// clang-format on
 };
 /** Maps from panel_button_id to hotkey name. */
-char *PanBtnHotKey[8] = { "'c'", "'q'", "Tab", "Esc", "'i'", "'b'", "Enter", NULL };
+const char *const PanBtnHotKey[8] = { "'c'", "'q'", "Tab", "Esc", "'i'", "'b'", "Enter", NULL };
 /** Maps from panel_button_id to panel button description. */
-char *PanBtnStr[8] = {
+const char *const PanBtnStr[8] = {
 	"Character Information",
 	"Quests log",
 	"Automap",
@@ -978,7 +978,7 @@ void PrintChar(int nOffset, int nCel, char col)
 #endif
 }
 
-void AddPanelString(char *str, BOOL just)
+void AddPanelString(const char *str, BOOL just)
 {
 	strcpy(panelstr[pnumlines], str);
 	pstrjust[pnumlines] = just;
@@ -1851,10 +1851,10 @@ void PrintInfo()
 	}
 }
 
-void CPrintString(int y, char *str, BOOL center, int lines)
+void CPrintString(int y, const char *str, BOOL center, int lines)
 {
 	BYTE c;
-	char *tmp;
+	const char *tmp;
 	int strWidth, lineOffset, lineStart;
 
 	lineOffset = 0;
@@ -1883,7 +1883,7 @@ void CPrintString(int y, char *str, BOOL center, int lines)
 	}
 }
 
-void PrintGameStr(int x, int y, char *str, int color)
+void PrintGameStr(int x, int y, const char *str, int color)
 {
 	BYTE c;
 	int off;
@@ -2124,10 +2124,10 @@ void DrawChr()
 /**
  * @brief Identical to MY_PlrStringXY(x, y, width, pszStr, col, 1)
  */
-void ADD_PlrStringXY(int x, int y, int width, char *pszStr, char col)
+void ADD_PlrStringXY(int x, int y, int width, const char *pszStr, char col)
 {
 	BYTE c;
-	char *tmp;
+	const char *tmp;
 	int nOffset, screen_x, line, widthOffset;
 
 	nOffset = x + PitchTbl[y + SCREEN_Y] + SCREEN_X;
@@ -2163,10 +2163,10 @@ void ADD_PlrStringXY(int x, int y, int width, char *pszStr, char col)
  * @param col text_color color value
  * @param base Letter spacing
  */
-void MY_PlrStringXY(int x, int y, int endX, char *pszStr, char col, int base)
+void MY_PlrStringXY(int x, int y, int endX, const char *pszStr, char col, int base)
 {
 	BYTE c;
-	char *tmp;
+	const char *tmp;
 	int nOffset, screen_x, line, widthOffset;
 
 	nOffset = x + PitchTbl[y + SCREEN_Y] + SCREEN_X;
@@ -2520,10 +2520,10 @@ void DrawSpellBook()
 	}
 }
 
-void PrintSBookStr(int x, int y, BOOL cjustflag, char *pszStr, char col)
+void PrintSBookStr(int x, int y, BOOL cjustflag, const char *pszStr, char col)
 {
 	BYTE c;
-	char *tmp;
+	const char *tmp;
 	int screen_x, line, width;
 
 	width = PitchTbl[y] + x + RIGHT_PANEL_X + SPLICONLENGTH;
@@ -2584,9 +2584,9 @@ void CheckSBook()
 #endif
 }
 
-char *get_pieces_str(int nGold)
+const char *get_pieces_str(int nGold)
 {
-	char *result;
+	const char *result;
 
 	result = "piece";
 	if (nGold != 1)
diff --git a/Source/control.h b/Source/control.h
index a43fe4768..c313d6887 100644
--- a/Source/control.h
+++ b/Source/control.h
@@ -65,7 +65,7 @@ void SetSpell();
 void SetSpeedSpell(int slot);
 void ToggleSpell(int slot);
 void PrintChar(int nOffset, int nCel, char col);
-void AddPanelString(char *str, BOOL just);
+void AddPanelString(const char *str, BOOL just);
 void ClearPanel();
 void DrawPanelBox(int x, int y, int w, int h, int sx, int sy);
 void InitPanelStr();
@@ -90,11 +90,11 @@ void FreeControlPan();
 BOOL control_WriteStringToBuffer(BYTE *str);
 void DrawInfoBox();
 void PrintInfo();
-void CPrintString(int y, char *str, BOOL center, int lines);
-void PrintGameStr(int x, int y, char *str, int color);
+void CPrintString(int y, const char *str, BOOL center, int lines);
+void PrintGameStr(int x, int y, const char *str, int color);
 void DrawChr();
-void ADD_PlrStringXY(int x, int y, int width, char *pszStr, char col);
-void MY_PlrStringXY(int x, int y, int width, char *pszStr, char col, int base);
+void ADD_PlrStringXY(int x, int y, int width, const char *pszStr, char col);
+void MY_PlrStringXY(int x, int y, int width, const char *pszStr, char col, int base);
 void CheckLvlBtn();
 void ReleaseLvlBtn();
 void DrawLevelUpIcon();
@@ -105,9 +105,9 @@ int DrawDurIcon4Item(ItemStruct *pItem, int x, int c);
 void RedBack();
 char GetSBookTrans(int ii, BOOL townok);
 void DrawSpellBook();
-void PrintSBookStr(int x, int y, BOOL cjustflag, char *pszStr, char col);
+void PrintSBookStr(int x, int y, BOOL cjustflag, const char *pszStr, char col);
 void CheckSBook();
-char *get_pieces_str(int nGold);
+const char *get_pieces_str(int nGold);
 void DrawGoldSplit(int amount);
 void control_drop_gold(char vkey);
 void control_remove_gold(int pnum, int gold_index);
@@ -134,8 +134,8 @@ extern const BYTE gbFontTransTbl[256];
 
 extern char SpellITbl[MAX_SPELLS];
 extern int PanBtnPos[8][5];
-extern char *PanBtnHotKey[8];
-extern char *PanBtnStr[8];
+extern const char *const PanBtnHotKey[8];
+extern const char *const PanBtnStr[8];
 extern RECT32 ChrBtnsRect[4];
 extern int SpellPages[6][7];
 
diff --git a/Source/diablo.cpp b/Source/diablo.cpp
index a7a471eab..30ceac5e4 100644
--- a/Source/diablo.cpp
+++ b/Source/diablo.cpp
@@ -84,14 +84,14 @@ int framestart;
 /** Specifies whether players are in non-PvP mode. */
 BOOL FriendlyMode = TRUE;
 /** Default quick messages */
-char *spszMsgTbl[4] = {
+const char *const spszMsgTbl[4] = {
 	"I need help! Come Here!",
 	"Follow me.",
 	"Here's something for you.",
 	"Now you DIE!"
 };
 /** INI files variable names for quick message keys */
-char *spszMsgHotKeyTbl[4] = { "F9", "F10", "F11", "F12" };
+const char *const spszMsgHotKeyTbl[4] = { "F9", "F10", "F11", "F12" };
 
 void FreeGameMem()
 {
diff --git a/Source/diablo.h b/Source/diablo.h
index 97a04b3fb..e9baa44f4 100644
--- a/Source/diablo.h
+++ b/Source/diablo.h
@@ -120,7 +120,7 @@ extern int framerate;
 extern int framestart;
 #endif
 extern BOOL FriendlyMode;
-extern char *spszMsgTbl[4];
-extern char *spszMsgHotKeyTbl[4];
+extern const char *const spszMsgTbl[4];
+extern const char *const spszMsgHotKeyTbl[4];
 
 #endif /* __DIABLO_H__ */
diff --git a/Source/drlg_l1.cpp b/Source/drlg_l1.cpp
index e355721ee..e960fe02a 100644
--- a/Source/drlg_l1.cpp
+++ b/Source/drlg_l1.cpp
@@ -1252,7 +1252,7 @@ static void DRLG_InitL1Vals()
 }
 
 #ifndef SPAWN
-void LoadL1Dungeon(char *sFileName, int vx, int vy)
+void LoadL1Dungeon(const char *sFileName, int vx, int vy)
 {
 	int i, j, rw, rh;
 	BYTE *pLevelMap, *lm;
@@ -1304,7 +1304,7 @@ void LoadL1Dungeon(char *sFileName, int vx, int vy)
 	mem_free_dbg(pLevelMap);
 }
 
-void LoadPreL1Dungeon(char *sFileName, int vx, int vy)
+void LoadPreL1Dungeon(const char *sFileName, int vx, int vy)
 {
 	int i, j, rw, rh;
 	BYTE *pLevelMap, *lm;
diff --git a/Source/drlg_l1.h b/Source/drlg_l1.h
index fdccf1efb..6d1bd4746 100644
--- a/Source/drlg_l1.h
+++ b/Source/drlg_l1.h
@@ -28,8 +28,8 @@ extern int VR3;
 extern BYTE *L5pSetPiece;
 
 void DRLG_Init_Globals();
-void LoadL1Dungeon(char *sFileName, int vx, int vy);
-void LoadPreL1Dungeon(char *sFileName, int vx, int vy);
+void LoadL1Dungeon(const char *sFileName, int vx, int vy);
+void LoadPreL1Dungeon(const char *sFileName, int vx, int vy);
 void CreateL5Dungeon(DWORD rseed, int entry);
 #ifdef HELLFIRE
 void DRLG_InitL5Vals();
diff --git a/Source/drlg_l2.cpp b/Source/drlg_l2.cpp
index 773f1850c..1509b88e5 100644
--- a/Source/drlg_l2.cpp
+++ b/Source/drlg_l2.cpp
@@ -3364,7 +3364,7 @@ static void DRLG_InitL2Vals()
 	}
 }
 
-void LoadL2Dungeon(char *sFileName, int vx, int vy)
+void LoadL2Dungeon(const char *sFileName, int vx, int vy)
 {
 	int i, j, rw, rh, pc;
 	BYTE *pLevelMap, *lm;
@@ -3454,7 +3454,7 @@ void LoadL2Dungeon(char *sFileName, int vx, int vy)
 	mem_free_dbg(pLevelMap);
 }
 
-void LoadPreL2Dungeon(char *sFileName, int vx, int vy)
+void LoadPreL2Dungeon(const char *sFileName, int vx, int vy)
 {
 	int i, j, rw, rh;
 	BYTE *pLevelMap, *lm;
diff --git a/Source/drlg_l2.h b/Source/drlg_l2.h
index c0a7a0184..f13097083 100644
--- a/Source/drlg_l2.h
+++ b/Source/drlg_l2.h
@@ -18,8 +18,8 @@ extern HALLNODE *pHallList;
 void InitDungeon();
 void L2LockoutFix();
 void L2DoorFix();
-void LoadL2Dungeon(char *sFileName, int vx, int vy);
-void LoadPreL2Dungeon(char *sFileName, int vx, int vy);
+void LoadL2Dungeon(const char *sFileName, int vx, int vy);
+void LoadPreL2Dungeon(const char *sFileName, int vx, int vy);
 void CreateL2Dungeon(DWORD rseed, int entry);
 
 /* rdata */
diff --git a/Source/drlg_l3.cpp b/Source/drlg_l3.cpp
index 1c3f10624..b3f072fbb 100644
--- a/Source/drlg_l3.cpp
+++ b/Source/drlg_l3.cpp
@@ -2754,7 +2754,7 @@ void CreateL3Dungeon(DWORD rseed, int entry)
 	DRLG_SetPC();
 }
 
-void LoadL3Dungeon(char *sFileName, int vx, int vy)
+void LoadL3Dungeon(const char *sFileName, int vx, int vy)
 {
 	int i, j, rw, rh;
 	BYTE *pLevelMap, *lm;
@@ -2816,7 +2816,7 @@ void LoadL3Dungeon(char *sFileName, int vx, int vy)
 	mem_free_dbg(pLevelMap);
 }
 
-void LoadPreL3Dungeon(char *sFileName, int vx, int vy)
+void LoadPreL3Dungeon(const char *sFileName, int vx, int vy)
 {
 	int i, j, rw, rh;
 	BYTE *pLevelMap, *lm;
diff --git a/Source/drlg_l3.h b/Source/drlg_l3.h
index e63372c35..ef8319905 100644
--- a/Source/drlg_l3.h
+++ b/Source/drlg_l3.h
@@ -22,8 +22,8 @@ void CreateL3Dungeon(DWORD rseed, int entry);
 #ifdef HELLFIRE
 BOOLEAN drlg_l3_hive_rnd_piece(const BYTE *miniset, int rndper);
 #endif
-void LoadL3Dungeon(char *sFileName, int vx, int vy);
-void LoadPreL3Dungeon(char *sFileName, int vx, int vy);
+void LoadL3Dungeon(const char *sFileName, int vx, int vy);
+void LoadPreL3Dungeon(const char *sFileName, int vx, int vy);
 
 /* rdata */
 extern const BYTE L3ConvTbl[16];
diff --git a/Source/effects.cpp b/Source/effects.cpp
index 6d87a4d1f..8c3ca1410 100644
--- a/Source/effects.cpp
+++ b/Source/effects.cpp
@@ -1152,7 +1152,7 @@ void InitMonsterSND(int monst)
 void FreeMonsterSnd()
 {
 	int mtype, i, j, k;
-	char *file;
+	const char *file;
 	TSnd *pSnd;
 
 	for (i = 0; i < nummtypes; i++) {
@@ -1165,7 +1165,9 @@ void FreeMonsterSnd()
 					file = pSnd->sound_path;
 					pSnd->sound_path = NULL;
 					sound_file_cleanup(pSnd);
-					mem_free_dbg(file);
+
+					// pSnd->sound_path is malloc'd (but only for monsters).
+					mem_free_dbg(const_cast<char *>(file));
 				}
 			}
 		}
@@ -1474,7 +1476,7 @@ void ui_sound_init()
 	priv_sound_init(sfx_UI);
 }
 
-void __stdcall effects_play_sound(char *snd_file)
+void __stdcall effects_play_sound(const char *snd_file)
 {
 	DWORD i;
 
diff --git a/Source/effects.h b/Source/effects.h
index 46aeb95dc..4c41573f3 100644
--- a/Source/effects.h
+++ b/Source/effects.h
@@ -30,7 +30,7 @@ void effects_cleanup_sfx();
 void sound_init();
 void priv_sound_init(BYTE bLoadMask);
 void ui_sound_init();
-void __stdcall effects_play_sound(char *snd_file);
+void __stdcall effects_play_sound(const char *snd_file);
 
 /* rdata */
 
diff --git a/Source/engine.cpp b/Source/engine.cpp
index de2f34ae3..10e15ed1c 100644
--- a/Source/engine.cpp
+++ b/Source/engine.cpp
@@ -2629,7 +2629,7 @@ void mem_free_dbg(void *p)
  * @param pdwFileLen Will be set to file size if non-NULL
  * @return Buffer with content of file
  */
-BYTE *LoadFileInMem(char *pszName, DWORD *pdwFileLen)
+BYTE *LoadFileInMem(const char *pszName, DWORD *pdwFileLen)
 {
 	HANDLE file;
 	BYTE *buf;
@@ -4132,7 +4132,7 @@ void Cl2DrawLightSafe(int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth, int
  * @brief Fade to black and play a video
  * @param pszMovie file path of movie
  */
-void PlayInGameMovie(char *pszMovie)
+void PlayInGameMovie(const char *pszMovie)
 {
 	PaletteFadeOut(8);
 	play_movie(pszMovie, FALSE);
diff --git a/Source/engine.h b/Source/engine.h
index 9fce6d3a4..bbcb7f47c 100644
--- a/Source/engine.h
+++ b/Source/engine.h
@@ -61,7 +61,7 @@ int random_(BYTE idx, int v);
 void engine_debug_trap(BOOL show_cursor);
 BYTE *DiabloAllocPtr(DWORD dwBytes);
 void mem_free_dbg(void *p);
-BYTE *LoadFileInMem(char *pszName, DWORD *pdwFileLen);
+BYTE *LoadFileInMem(const char *pszName, DWORD *pdwFileLen);
 DWORD LoadFileWithMem(const char *pszName, BYTE *p);
 void Cl2ApplyTrans(BYTE *p, BYTE *ttbl, int nCel);
 void Cl2Draw(int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth, int CelSkip, int CelCap);
@@ -78,7 +78,7 @@ void Cl2BlitOutlineSafe(BYTE *pDecodeTo, BYTE *pRLEBytes, int nDataSize, int nWi
 void Cl2DrawLightTblSafe(int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth, int CelSkip, int CelCap, char light);
 void Cl2BlitLightSafe(BYTE *pDecodeTo, BYTE *pRLEBytes, int nDataSize, int nWidth, BYTE *pTable);
 void Cl2DrawLightSafe(int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth, int CelSkip, int CelCap);
-void PlayInGameMovie(char *pszMovie);
+void PlayInGameMovie(const char *pszMovie);
 
 /* rdata */
 
diff --git a/Source/error.cpp b/Source/error.cpp
index e4272b2d0..526c6f5c1 100644
--- a/Source/error.cpp
+++ b/Source/error.cpp
@@ -11,7 +11,7 @@ char msgflag;
 char msgcnt;
 
 /** Maps from error_id to error message. */
-char *MsgStrings[] = {
+const char *const MsgStrings[] = {
 	"",
 	"No automap available in town",
 	"No multiplayer functions in demo",
diff --git a/Source/error.h b/Source/error.h
index 770506b18..60e52a981 100644
--- a/Source/error.h
+++ b/Source/error.h
@@ -16,6 +16,6 @@ void ClrDiabloMsg();
 void DrawDiabloMsg();
 
 /* data */
-extern char *MsgStrings[];
+extern const char *const MsgStrings[];
 
 #endif /* __ERROR_H__ */
diff --git a/Source/gamemenu.cpp b/Source/gamemenu.cpp
index e6c991b96..68bf1f660 100644
--- a/Source/gamemenu.cpp
+++ b/Source/gamemenu.cpp
@@ -58,12 +58,12 @@ TMenuItem sgOptionsMenu[] = {
 // clang-format on
 };
 /** Specifies the menu names for music enabled and disabled. */
-char *music_toggle_names[] = {
+const char *const music_toggle_names[] = {
 	"Music",
 	"Music Disabled",
 };
 /** Specifies the menu names for sound enabled and disabled. */
-char *sound_toggle_names[] = {
+const char *const sound_toggle_names[] = {
 	"Sound",
 	"Sound Disabled",
 };
@@ -76,7 +76,7 @@ char *jogging_title = "Fast Walk";
 #endif
 #ifndef HELLFIRE
 /** Specifies the menu names for colour cycling disabled and enabled. */
-char *color_cycling_toggle_names[] = { "Color Cycling Off", "Color Cycling On" };
+const char *const color_cycling_toggle_names[] = { "Color Cycling Off", "Color Cycling On" };
 #endif
 
 void gamemenu_on()
@@ -227,7 +227,7 @@ void gamemenu_get_music()
 	gamemenu_sound_music_toggle(music_toggle_names, sgOptionsMenu, sound_get_or_set_music_volume(1));
 }
 
-void gamemenu_sound_music_toggle(char **names, TMenuItem *menu_item, int volume)
+void gamemenu_sound_music_toggle(const char *const *names, TMenuItem *menu_item, int volume)
 {
 	if (gbSndInited) {
 		menu_item->dwFlags |= GMENU_ENABLED | GMENU_SLIDER;
diff --git a/Source/gamemenu.h b/Source/gamemenu.h
index f8f6acf8e..a1da138c3 100644
--- a/Source/gamemenu.h
+++ b/Source/gamemenu.h
@@ -24,7 +24,7 @@ void gamemenu_save_game(BOOL bActivate);
 void gamemenu_restart_town(BOOL bActivate);
 void gamemenu_options(BOOL bActivate);
 void gamemenu_get_music();
-void gamemenu_sound_music_toggle(char **names, TMenuItem *menu_item, int gamma);
+void gamemenu_sound_music_toggle(const char *const *names, TMenuItem *menu_item, int gamma);
 void gamemenu_get_sound();
 #ifdef HELLFIRE
 void gamemenu_jogging();
@@ -46,10 +46,10 @@ void gamemenu_color_cycling(BOOL bActivate);
 #endif
 
 /* rdata */
-extern char *music_toggle_names[];
-extern char *sound_toggle_names[];
+extern const char *const music_toggle_names[];
+extern const char *const sound_toggle_names[];
 #ifndef HELLFIRE
-extern char *color_cycling_toggle_names[];
+extern const char *const color_cycling_toggle_names[];
 #endif
 
 #endif /* __GAMEMENU_H__ */
diff --git a/Source/gmenu.cpp b/Source/gmenu.cpp
index 210d3e6ac..1fb04af15 100644
--- a/Source/gmenu.cpp
+++ b/Source/gmenu.cpp
@@ -59,7 +59,7 @@ void gmenu_draw_pause()
 	}
 }
 
-void gmenu_print_text(int x, int y, char *pszStr)
+void gmenu_print_text(int x, int y, const char *pszStr)
 {
 	BYTE c;
 
@@ -252,7 +252,7 @@ void gmenu_clear_buffer(int x, int y, int width, int height)
 
 int gmenu_get_lfont(TMenuItem *pItem)
 {
-	char *text;
+	const char *text;
 	int i;
 	BYTE c;
 
diff --git a/Source/gmenu.h b/Source/gmenu.h
index 2f028b214..0cd15635d 100644
--- a/Source/gmenu.h
+++ b/Source/gmenu.h
@@ -18,7 +18,7 @@ extern BYTE *option_cel;
 extern int sgCurrentMenuIdx;
 
 void gmenu_draw_pause();
-void gmenu_print_text(int x, int y, char *pszStr);
+void gmenu_print_text(int x, int y, const char *pszStr);
 void FreeGMenu();
 void gmenu_init_menu();
 BOOL gmenu_is_active();
diff --git a/Source/init.cpp b/Source/init.cpp
index 14a25730a..0194ac4fa 100644
--- a/Source/init.cpp
+++ b/Source/init.cpp
@@ -339,7 +339,7 @@ void init_archives()
 #endif
 }
 
-HANDLE init_test_access(char *mpq_path, char *mpq_name, char *reg_loc, int dwPriority, int fs)
+HANDLE init_test_access(char *mpq_path, const char *mpq_name, const char *reg_loc, int dwPriority, int fs)
 {
 	char *last_slash_pos;
 	char Filename[MAX_PATH];
@@ -396,7 +396,7 @@ void init_strip_trailing_slash(char *path)
 	}
 }
 
-BOOL init_read_test_file(char *pszPath, char *pszArchive, int dwPriority, HANDLE *phArchive)
+BOOL init_read_test_file(char *pszPath, const char *pszArchive, int dwPriority, HANDLE *phArchive)
 {
 	DWORD dwSize;
 	char *pszDrive, *pszRoot;
diff --git a/Source/init.h b/Source/init.h
index c9a5a62eb..70babe5b6 100644
--- a/Source/init.h
+++ b/Source/init.h
@@ -44,9 +44,9 @@ void init_kill_mom_parent();
 HWND init_find_mom_parent();
 void init_await_mom_parent_exit();
 void init_archives();
-HANDLE init_test_access(char *mpq_path, char *mpq_name, char *reg_loc, int flags, int fs);
+HANDLE init_test_access(char *mpq_path, const char *mpq_name, const char *reg_loc, int flags, int fs);
 void init_strip_trailing_slash(char *path);
-BOOL init_read_test_file(char *pszPath, char *pszArchive, int flags, HANDLE *phArchive);
+BOOL init_read_test_file(char *pszPath, const char *pszArchive, int flags, HANDLE *phArchive);
 void init_get_file_info();
 LRESULT __stdcall MainWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
 void init_activate_window(HWND hWnd, BOOL bActive);
diff --git a/Source/inv.cpp b/Source/inv.cpp
index 105169431..287914433 100644
--- a/Source/inv.cpp
+++ b/Source/inv.cpp
@@ -2375,7 +2375,7 @@ BOOL TryInvPut()
 	return CanPut(plr[myplr]._px, plr[myplr]._py);
 }
 
-void DrawInvMsg(char *msg)
+void DrawInvMsg(const char *msg)
 {
 	DWORD dwTicks;
 
diff --git a/Source/inv.h b/Source/inv.h
index 89ce171c3..4bdd578ca 100644
--- a/Source/inv.h
+++ b/Source/inv.h
@@ -39,7 +39,7 @@ int FindGetItem(int idx, WORD ci, int iseed);
 void SyncGetItem(int x, int y, int idx, WORD ci, int iseed);
 BOOL CanPut(int x, int y);
 BOOL TryInvPut();
-void DrawInvMsg(char *msg);
+void DrawInvMsg(const char *msg);
 int InvPutItem(int pnum, int x, int y);
 int SyncPutItem(int pnum, int x, int y, int idx, WORD icreateinfo, int iseed, int Id, int dur, int mdur, int ch, int mch, int ivalue, DWORD ibuff
 #ifdef HELLFIRE
diff --git a/Source/items.cpp b/Source/items.cpp
index 32622c82d..1f30aff9b 100644
--- a/Source/items.cpp
+++ b/Source/items.cpp
@@ -106,7 +106,7 @@ BYTE ItemCAnimTbl[] = {
 #endif
 };
 /** Map of item type .cel file names. */
-char *ItemDropNames[] = {
+const char *const ItemDropNames[] = {
 	"Armor2",
 	"Axe",
 	"FBttle",
@@ -4240,7 +4240,7 @@ void DrawUTextBack()
 #include "asm_trans_rect.inc"
 }
 
-void PrintUString(int x, int y, BOOL cjustflag, char *str, int col)
+void PrintUString(int x, int y, BOOL cjustflag, const char *str, int col)
 {
 	int len, width, off, i, k;
 	BYTE c;
diff --git a/Source/items.h b/Source/items.h
index 8f134b021..05827316d 100644
--- a/Source/items.h
+++ b/Source/items.h
@@ -127,7 +127,7 @@ void RechargeItem(ItemStruct *i, int r);
 void PrintItemOil(char IDidx);
 void PrintItemPower(char plidx, ItemStruct *x);
 void DrawUTextBack();
-void PrintUString(int x, int y, BOOL cjustflag, char *str, int col);
+void PrintUString(int x, int y, BOOL cjustflag, const char *str, int col);
 void DrawULine(int y);
 void DrawUniqueInfo();
 void PrintItemMisc(ItemStruct *x);
@@ -190,7 +190,7 @@ extern int MaxGold;
 #endif
 
 extern BYTE ItemCAnimTbl[];
-extern char *ItemDropNames[];
+extern const char *const ItemDropNames[];
 extern BYTE ItemAnimLs[];
 extern int ItemDropSnds[];
 extern int ItemInvSnds[];
diff --git a/Source/minitext.cpp b/Source/minitext.cpp
index 483a5caf4..00730eef0 100644
--- a/Source/minitext.cpp
+++ b/Source/minitext.cpp
@@ -6,7 +6,7 @@
 #include "all.h"
 
 int qtexty;
-char *qtextptr;
+const char *qtextptr;
 int sgLastScroll;
 BOOLEAN qtextflag;
 int qtextDelay;
@@ -211,7 +211,7 @@ void DrawQText()
 {
 	int i, l, w, tx, ty;
 	BYTE c;
-	char *p, *pnl, *s;
+	const char *p, *pnl, *s;
 	char tempstr[128];
 	BOOL doneflag;
 	DWORD currTime;
diff --git a/Source/minitext.h b/Source/minitext.h
index 5dcf85278..effcd18d0 100644
--- a/Source/minitext.h
+++ b/Source/minitext.h
@@ -7,7 +7,7 @@
 #define __MINITEXT_H__
 
 extern int qtexty;
-extern char *qtextptr;
+extern const char *qtextptr;
 extern BOOLEAN qtextflag;
 extern BYTE *pMedTextCels;
 extern BYTE *pTextBoxCels;
diff --git a/Source/movie.cpp b/Source/movie.cpp
index 2fb9d7d1c..e1433328f 100644
--- a/Source/movie.cpp
+++ b/Source/movie.cpp
@@ -16,7 +16,7 @@ BOOL loop_movie;
  * @param pszMovie The file name of the video
  * @param user_can_close Set to false to make the video unskippable.
  */
-void play_movie(char *pszMovie, BOOL user_can_close)
+void play_movie(const char *pszMovie, BOOL user_can_close)
 {
 	WNDPROC saveProc;
 	HANDLE video_stream;
diff --git a/Source/movie.h b/Source/movie.h
index f61ba7891..d99b1c343 100644
--- a/Source/movie.h
+++ b/Source/movie.h
@@ -9,7 +9,7 @@
 extern BYTE movie_playing;
 extern BOOL loop_movie;
 
-void play_movie(char *pszMovie, BOOL user_can_close);
+void play_movie(const char *pszMovie, BOOL user_can_close);
 LRESULT __stdcall MovieWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
 
 /* rdata */
diff --git a/Source/multi.cpp b/Source/multi.cpp
index d14951986..f78ff3b40 100644
--- a/Source/multi.cpp
+++ b/Source/multi.cpp
@@ -279,7 +279,7 @@ void multi_clear_left_tbl()
 
 void multi_player_left_msg(int pnum, int left)
 {
-	char *pszFmt;
+	const char *pszFmt;
 
 	if (plr[pnum].plractive) {
 		RemovePlrFromMap(pnum);
@@ -945,7 +945,7 @@ BOOL multi_upgrade(BOOL *pfExitProgram)
 
 void recv_plrinfo(int pnum, TCmdPlrInfoHdr *p, BOOL recv)
 {
-	char *szEvent;
+	const char *szEvent;
 
 	if (myplr == pnum) {
 		return;
diff --git a/Source/objdat.cpp b/Source/objdat.cpp
index e0fc078f4..65a09cae9 100644
--- a/Source/objdat.cpp
+++ b/Source/objdat.cpp
@@ -233,7 +233,7 @@ ObjDataStruct AllObjects[] = {
 };
 
 /** Maps from object_graphic_id to object CEL name. */
-char *ObjMasterLoadList[] = { // might be const
+const char *const ObjMasterLoadList[] = {
 	"L1Braz",
 	"L1Doors",
 	"Lever",
diff --git a/Source/objdat.h b/Source/objdat.h
index e93033f6a..43e9f9467 100644
--- a/Source/objdat.h
+++ b/Source/objdat.h
@@ -8,7 +8,7 @@
 
 extern int ObjTypeConv[];
 extern ObjDataStruct AllObjects[];
-extern char *ObjMasterLoadList[];
+extern const char *const ObjMasterLoadList[];
 #ifdef HELLFIRE
 extern char *ObjCryptLoadList[];
 extern char *ObjHiveLoadList[];
diff --git a/Source/objects.cpp b/Source/objects.cpp
index 11c65c273..4af8d813b 100644
--- a/Source/objects.cpp
+++ b/Source/objects.cpp
@@ -26,7 +26,7 @@ int bxadd[8] = { -1, 0, 1, -1, 1, -1, 0, 1 };
 /** Specifies the Y-coordinate delta between barrels. */
 int byadd[8] = { -1, -1, -1, 0, 0, 1, 1, 1 };
 /** Maps from shrine_id to shrine name. */
-char *shrinestrs[NUM_SHRINETYPE] = {
+const char *const shrinestrs[NUM_SHRINETYPE] = {
 	"Mysterious",
 	"Hidden",
 	"Gloomy",
@@ -188,7 +188,7 @@ BYTE shrineavail[NUM_SHRINETYPE] = {
 #endif
 };
 /** Maps from book_id to book name. */
-char *StoryBookName[] = {
+const char *const StoryBookName[] = {
 	"The Great Conflict",
 	"The Wages of Sin are War",
 	"The Tale of the Horadrim",
diff --git a/Source/objects.h b/Source/objects.h
index c9b56871c..1bd591475 100644
--- a/Source/objects.h
+++ b/Source/objects.h
@@ -178,11 +178,11 @@ DIABOOL objects_lv_24_454B04(int s);
 
 extern int bxadd[8];
 extern int byadd[8];
-extern char *shrinestrs[NUM_SHRINETYPE];
+extern const char *const shrinestrs[NUM_SHRINETYPE];
 extern char shrinemin[NUM_SHRINETYPE];
 extern char shrinemax[NUM_SHRINETYPE];
 extern BYTE shrineavail[NUM_SHRINETYPE];
-extern char *StoryBookName[];
+extern const char *const StoryBookName[];
 extern int StoryText[3][3];
 
 #endif /* __OBJECTS_H__ */
diff --git a/Source/palette.cpp b/Source/palette.cpp
index a9ead6852..9598ab084 100644
--- a/Source/palette.cpp
+++ b/Source/palette.cpp
@@ -135,7 +135,7 @@ void palette_init()
 #endif
 }
 
-void LoadPalette(char *pszFileName)
+void LoadPalette(const char *pszFileName)
 {
 	int i;
 	void *pBuf;
diff --git a/Source/palette.h b/Source/palette.h
index 86be17cf7..6be78399f 100644
--- a/Source/palette.h
+++ b/Source/palette.h
@@ -13,7 +13,7 @@ extern int gdwPalEntries;
 
 void SaveGamma();
 void palette_init();
-void LoadPalette(char *pszFileName);
+void LoadPalette(const char *pszFileName);
 void LoadRndLvlPal(int l);
 void ResetPal();
 void IncreaseGamma();
diff --git a/Source/player.cpp b/Source/player.cpp
index 7c7af0859..3b692e990 100644
--- a/Source/player.cpp
+++ b/Source/player.cpp
@@ -150,7 +150,7 @@ int ToBlkTbl[NUM_CLASSES] = {
 	30,
 #endif
 };
-char *ClassStrTblOld[] = {
+const char *const ClassStrTblOld[] = {
 	"Warrior",
 	"Rogue",
 	"Sorceror",
@@ -225,7 +225,7 @@ int ExpLvlsTbl[MAXCHARLEVEL] = {
 	1310707109,
 	1583495809
 };
-char *ClassStrTbl[NUM_CLASSES] = {
+const char *const ClassStrTbl[NUM_CLASSES] = {
 	"Warrior",
 	"Rogue",
 	"Sorceror",
@@ -251,9 +251,9 @@ void LoadPlrGFX(int pnum, player_graphic gfxflag)
 {
 	char prefix[16];
 	char pszName[256];
-	char *szCel;
+	const char *szCel;
 	PlayerStruct *p;
-	char *cs;
+	const char *cs;
 	BYTE *pData, *pAnim;
 	DWORD i;
 
@@ -454,7 +454,7 @@ void InitPlrGFXMem(int pnum)
 	plr[pnum]._pGFXLoad = 0;
 }
 
-DWORD GetPlrGFXSize(char *szCel)
+DWORD GetPlrGFXSize(const char *szCel)
 {
 	DWORD c;
 	const char *a, *w;
diff --git a/Source/player.h b/Source/player.h
index 40c180814..ae79ba510 100644
--- a/Source/player.h
+++ b/Source/player.h
@@ -30,7 +30,7 @@ void SetPlayerGPtrs(BYTE *pData, BYTE **pAnim);
 void LoadPlrGFX(int pnum, player_graphic gfxflag);
 void InitPlayerGFX(int pnum);
 void InitPlrGFXMem(int pnum);
-DWORD GetPlrGFXSize(char *szCel);
+DWORD GetPlrGFXSize(const char *szCel);
 void FreePlayerGFX(int pnum);
 void NewPlrAnim(int pnum, BYTE *Peq, int numFrames, int Delay, int width);
 void ClearPlrPVars(int pnum);
@@ -145,10 +145,10 @@ extern int MagicTbl[NUM_CLASSES];
 extern int DexterityTbl[NUM_CLASSES];
 extern int VitalityTbl[NUM_CLASSES];
 extern int ToBlkTbl[NUM_CLASSES];
-extern char *ClassStrTblOld[];
+extern const char *const ClassStrTblOld[];
 extern int MaxStats[NUM_CLASSES][4];
 extern int ExpLvlsTbl[MAXCHARLEVEL];
-extern char *ClassStrTbl[NUM_CLASSES];
+extern const char *const ClassStrTbl[NUM_CLASSES];
 extern BYTE fix[9];
 
 #endif /* __PLAYER_H__ */
diff --git a/Source/quests.cpp b/Source/quests.cpp
index c9a9c4503..208193258 100644
--- a/Source/quests.cpp
+++ b/Source/quests.cpp
@@ -63,7 +63,7 @@ char questxoff[7] = { 0, -1, 0, -1, -2, -1, -2 };
  * which the hover text of the cursor will be visible.
  */
 char questyoff[7] = { 0, 0, -1, -1, -1, -2, -2 };
-char *questtrigstr[5] = {
+const char *const questtrigstr[5] = {
 	"King Leoric's Tomb",
 	"The Chamber of Bone",
 	"Maze",
@@ -823,7 +823,7 @@ void ResyncQuests()
 #endif
 }
 
-void PrintQLString(int x, int y, BOOL cjustflag, char *str, int col)
+void PrintQLString(int x, int y, BOOL cjustflag, const char *str, int col)
 {
 	int len, width, off, i, k, s;
 	BYTE c;
diff --git a/Source/quests.h b/Source/quests.h
index 6809a3277..04ee9f846 100644
--- a/Source/quests.h
+++ b/Source/quests.h
@@ -37,7 +37,7 @@ void SetReturnLvlPos();
 void GetReturnLvlPos();
 void ResyncMPQuests();
 void ResyncQuests();
-void PrintQLString(int x, int y, BOOL cjustflag, char *str, int col);
+void PrintQLString(int x, int y, BOOL cjustflag, const char *str, int col);
 void DrawQuestLog();
 void StartQuestlog();
 void QuestlogUp();
@@ -50,7 +50,7 @@ void SetMultiQuest(int q, int s, int l, int v1);
 extern QuestData questlist[MAXQUESTS];
 extern char questxoff[7];
 extern char questyoff[7];
-extern char *questtrigstr[5];
+extern const char *constquesttrigstr[5];
 extern int QuestGroup1[3];
 extern int QuestGroup2[3];
 extern int QuestGroup3[3];
diff --git a/Source/scrollrt.cpp b/Source/scrollrt.cpp
index 8c247d10f..91d958898 100644
--- a/Source/scrollrt.cpp
+++ b/Source/scrollrt.cpp
@@ -60,7 +60,7 @@ DWORD sgdwCursHgtOld;
 /* data */
 
 /* used in 1.00 debug */
-char *szMonModeAssert[18] = {
+const char *const szMonModeAssert[18] = {
 	"standing",
 	"walking (1)",
 	"walking (2)",
@@ -81,7 +81,7 @@ char *szMonModeAssert[18] = {
 	"talking"
 };
 
-char *szPlrModeAssert[12] = {
+const char *const szPlrModeAssert[12] = {
 	"standing",
 	"walking (1)",
 	"walking (2)",
diff --git a/Source/scrollrt.h b/Source/scrollrt.h
index 8141ae2ea..b83165d14 100644
--- a/Source/scrollrt.h
+++ b/Source/scrollrt.h
@@ -38,7 +38,7 @@ void DrawAndBlit();
 /* data */
 
 /** used in 1.00 debug */
-extern char *szMonModeAssert[18];
-extern char *szPlrModeAssert[12];
+extern const char *const szMonModeAssert[18];
+extern const char *const szPlrModeAssert[12];
 
 #endif /* __SCROLLRT_H__ */
diff --git a/Source/setmaps.cpp b/Source/setmaps.cpp
index 5c3035796..dbd89ebf0 100644
--- a/Source/setmaps.cpp
+++ b/Source/setmaps.cpp
@@ -60,7 +60,7 @@ BYTE SkelChamTrans3[] = {
 };
 
 /** Maps from quest level to quest level names. */
-char *quest_level_names[] = {
+const char *const quest_level_names[] = {
 	"",
 	"Skeleton King's Lair",
 	"Bone Chamber",
@@ -107,7 +107,7 @@ void AddVileObjs()
 	SetObjMapRange(ObjIndex(35, 36), 7, 11, 13, 18, 3);
 }
 
-void DRLG_SetMapTrans(char *sFileName)
+void DRLG_SetMapTrans(const char *sFileName)
 {
 	int x, y;
 	int i, j;
diff --git a/Source/setmaps.h b/Source/setmaps.h
index 6ca2dd236..ad797dc16 100644
--- a/Source/setmaps.h
+++ b/Source/setmaps.h
@@ -10,7 +10,7 @@ int ObjIndex(int x, int y);
 void AddSKingObjs();
 void AddSChamObjs();
 void AddVileObjs();
-void DRLG_SetMapTrans(char *sFileName);
+void DRLG_SetMapTrans(const char *sFileName);
 void LoadSetMap();
 
 /* rdata */
@@ -21,6 +21,6 @@ extern BYTE SkelKingTrans4[28];
 extern BYTE SkelChamTrans1[20];
 extern BYTE SkelChamTrans2[8];
 extern BYTE SkelChamTrans3[36];
-extern char *quest_level_names[];
+extern const char *const quest_level_names[];
 
 #endif /* __SETMAPS_H__ */
diff --git a/Source/sound.cpp b/Source/sound.cpp
index 42b75b544..7d4d030f6 100644
--- a/Source/sound.cpp
+++ b/Source/sound.cpp
@@ -28,7 +28,7 @@ BOOLEAN gbDupSounds = TRUE;
 /** Specifies the active background music track id. */
 int sgnMusicTrack = NUM_MUSIC;
 /** Maps from track ID to track name. */
-char *sgszMusicTracks[NUM_MUSIC] = {
+const char *const sgszMusicTracks[NUM_MUSIC] = {
 #ifdef SPAWN
 	"Music\\sTowne.wav",
 	"Music\\sLvlA.wav",
@@ -197,7 +197,7 @@ BOOL sound_file_reload(TSnd *sound_file, LPDIRECTSOUNDBUFFER DSB)
 	return rv;
 }
 
-TSnd *sound_file_load(char *path)
+TSnd *sound_file_load(const char *path)
 {
 	HANDLE file;
 	BYTE *wave_file;
@@ -287,7 +287,7 @@ void snd_init(HWND hWnd)
 	gbSndInited = sglpDS != NULL;
 }
 
-void snd_get_volume(char *value_name, int *value)
+void snd_get_volume(const char *value_name, int *value)
 {
 	int v = *value;
 	if (!SRegLoadValue(APP_NAME, value_name, 0, &v)) {
@@ -380,7 +380,7 @@ void sound_cleanup()
 	}
 }
 
-void snd_set_volume(char *key, int value)
+void snd_set_volume(const char *key, int value)
 {
 	SRegSaveValue(APP_NAME, key, 0, value);
 }
diff --git a/Source/sound.h b/Source/sound.h
index 45444eb0d..672e12bbe 100644
--- a/Source/sound.h
+++ b/Source/sound.h
@@ -16,15 +16,15 @@ BOOL snd_playing(TSnd *pSnd);
 void snd_play_snd(TSnd *pSnd, int lVolume, int lPan);
 IDirectSoundBuffer *sound_dup_channel(IDirectSoundBuffer *DSB);
 BOOL sound_file_reload(TSnd *sound_file, IDirectSoundBuffer *DSB);
-TSnd *sound_file_load(char *path);
+TSnd *sound_file_load(const char *path);
 void sound_CreateSoundBuffer(TSnd *sound_file);
 void sound_file_cleanup(TSnd *sound_file);
 void snd_init(HWND hWnd);
-void snd_get_volume(char *value_name, int *value);
+void snd_get_volume(const char *value_name, int *value);
 void sound_create_primary_buffer(HANDLE music_track);
 HRESULT sound_DirectSoundCreate(LPGUID lpGuid, LPDIRECTSOUND *ppDS, LPUNKNOWN pUnkOuter);
 void sound_cleanup();
-void snd_set_volume(char *key, int value);
+void snd_set_volume(const char *key, int value);
 void music_stop();
 void music_start(int nTrack);
 void sound_disable_music(BOOL disable);
diff --git a/Source/stores.cpp b/Source/stores.cpp
index 17eac713e..615b53cbd 100644
--- a/Source/stores.cpp
+++ b/Source/stores.cpp
@@ -71,7 +71,7 @@ int SStringY[24] = {
 	276
 };
 /** Maps from towner IDs to NPC names. */
-char *talkname[9] = {
+const char *const talkname[9] = {
 	"Griswold",
 	"Pepin",
 	"",
@@ -154,7 +154,7 @@ void DrawSTextBack()
 #include "asm_trans_rect.inc"
 }
 
-void PrintSString(int x, int y, BOOL cjustflag, char *str, char col, int val)
+void PrintSString(int x, int y, BOOL cjustflag, const char *str, char col, int val)
 {
 	int xx, yy;
 	int len, width, off, i, k, s;
@@ -325,7 +325,7 @@ void OffsetSTextY(int y, int yo)
 	stext[y]._syoff = yo;
 }
 
-void AddSText(int x, int y, BOOL j, char *str, char clr, BOOL sel)
+void AddSText(int x, int y, BOOL j, const char *str, char clr, BOOL sel)
 {
 	stext[y]._sx = x;
 	stext[y]._syoff = 0;
diff --git a/Source/stores.h b/Source/stores.h
index b28a296d1..c86539855 100644
--- a/Source/stores.h
+++ b/Source/stores.h
@@ -48,7 +48,7 @@ void InitStores();
 void SetupTownStores();
 void FreeStoreMem();
 void DrawSTextBack();
-void PrintSString(int x, int y, BOOL cjustflag, char *str, char col, int val);
+void PrintSString(int x, int y, BOOL cjustflag, const char *str, char col, int val);
 void DrawSLine(int y);
 void DrawSSlider(int y1, int y2);
 void DrawSTextHelp();
@@ -56,7 +56,7 @@ void ClearSText(int s, int e);
 void AddSLine(int y);
 void AddSTextVal(int y, int val);
 void OffsetSTextY(int y, int yo);
-void AddSText(int x, int y, BOOL j, char *str, char clr, BOOL sel);
+void AddSText(int x, int y, BOOL j, const char *str, char clr, BOOL sel);
 void StoreAutoPlace();
 void S_StartSmith();
 void S_ScrollSBuy(int idx);
@@ -143,6 +143,6 @@ void ReleaseStoreBtn();
 /* rdata */
 
 extern int SStringY[24];
-extern char *talkname[9];
+extern const char *const talkname[9];
 
 #endif /* __STORES_H__ */
diff --git a/structs.h b/structs.h
index 38377f51c..3e37fc907 100644
--- a/structs.h
+++ b/structs.h
@@ -35,7 +35,7 @@ typedef struct PLStruct {
 } PLStruct;
 
 typedef struct UItemStruct {
-	char *UIName;
+	const char *UIName;
 	char UIItemId;
 	char UIMinLvl;
 	char UINumPL;
@@ -67,8 +67,8 @@ typedef struct ItemDataStruct {
 	int iCurs;
 	char itype;
 	char iItemId;
-	char *iName;
-	char *iSName;
+	const char *iName;
+	const char *iSName;
 	char iMinMLvl;
 	int iDurability;
 	int iMinDam;
@@ -371,7 +371,7 @@ typedef struct PlayerStruct {
 //////////////////////////////////////////////////
 
 typedef struct TextDataStruct {
-	char *txtstr;
+	const char *txtstr;
 	int scrlltxt;
 	int txtspd;
 	int sfxnr;
@@ -399,7 +399,7 @@ typedef struct MissileData {
 typedef struct MisFileData {
 	unsigned char mAnimName;
 	unsigned char mAnimFAmt;
-	char *mName;
+	const char *mName;
 	int mFlags;
 	unsigned char *mAnimData[16];
 	unsigned char mAnimDelay[16];
@@ -473,7 +473,7 @@ typedef struct CKINFO {
 typedef struct TSnd {
 	WAVEFORMATEX fmt;
 	CKINFO chunk;
-	char *sound_path;
+	const char *sound_path;
 	LPDIRECTSOUNDBUFFER DSB;
 	int start_tc;
 } TSnd;
@@ -481,7 +481,7 @@ typedef struct TSnd {
 #pragma pack(push, 1)
 typedef struct TSFX {
 	unsigned char bFlags;
-	char *pszName;
+	const char *pszName;
 	TSnd *pSnd;
 } TSFX;
 #pragma pack(pop)
@@ -500,15 +500,15 @@ typedef struct AnimStruct {
 typedef struct MonsterData {
 	int width;
 	int mImage;
-	char *GraphicType;
+	const char *GraphicType;
 	BOOL has_special;
-	char *sndfile;
+	const char *sndfile;
 	BOOL snd_special;
 	BOOL has_trans;
-	char *TransFile;
+	const char *TransFile;
 	int Frames[6];
 	int Rate[6];
-	char *mName;
+	const char *mName;
 	char mMinDLvl;
 	char mMaxDLvl;
 	char mLevel;
@@ -634,7 +634,7 @@ typedef struct MonsterStruct { // note: missing field _mAFNum
 	unsigned char leaderflag;
 	unsigned char packsize;
 	unsigned char mlid;
-	char *mName;
+	const char *mName;
 	CMonster *MType;
 	MonsterData *MData;
 } MonsterStruct;
@@ -645,8 +645,8 @@ typedef struct UniqMonstStruct {
 #else
 	char mtype;
 #endif
-	char *mName;
-	char *mTrnName;
+	const char *mName;
+	const char *mTrnName;
 	unsigned char mlevel;
 	unsigned short mmaxhp;
 	unsigned char mAi;
@@ -1055,7 +1055,7 @@ typedef struct QuestData {
 	unsigned char _qslvl;
 	int _qflags; /* unsigned char */
 	int _qdmsg;
-	char *_qlstr;
+	const char *_qlstr;
 } QuestData;
 
 #ifdef HELLFIRE
@@ -1075,7 +1075,7 @@ typedef struct CornerStoneStruct {
 
 typedef struct TMenuItem {
 	DWORD dwFlags;
-	char *pszStr;
+	const char *pszStr;
 	void (*fnMenu)(BOOL); /* fix, should have one arg */
 } TMenuItem;
 
@@ -1089,8 +1089,8 @@ typedef struct SpellData {
 	unsigned char sName;
 	unsigned char sManaCost;
 	unsigned char sType;
-	char *sNameText;
-	char *sSkillText;
+	const char *sNameText;
+	const char *sSkillText;
 	int sBookLvl;
 	int sStaffLvl;
 	BOOL sTargeted;
@@ -1378,8 +1378,8 @@ typedef struct _SNETPLAYERDATA {
 
 typedef struct _SNETPROGRAMDATA {
 	int size;
-	char *programname;
-	char *programdescription;
+	const char *programname;
+	const char *programdescription;
 	int programid;
 	int versionid;
 	int reserved1;