Refuse to load if 16-bit support is missing.

dlls/winedos/dosexe.h

@@ -288,7 +288,7 @@ extern void WINAPI DOSVM_ASPIHandler(CONTEXT86*);
 extern DOSCONF *DOSCONF_GetConfig( void );
 
 /* dosmem.c */
-extern void DOSMEM_InitDosMemory(void);
+extern BOOL DOSMEM_InitDosMemory(void);
 extern BOOL DOSMEM_MapDosLayout(void);
 extern WORD   DOSMEM_AllocSelector(WORD); /* FIXME: to be removed */
 extern LPVOID DOSMEM_AllocBlock(UINT size, WORD* p);

dlls/winedos/dosmem.c

@@ -489,14 +489,14 @@ static void DOSMEM_InitMemory(char* addr)
  *
  * When WineDOS is loaded, initializes the current DOS memory layout.
  */
-void DOSMEM_InitDosMemory(void)
+BOOL DOSMEM_InitDosMemory(void)
 {
     HMODULE16           hModule;
     unsigned short      sel;
     LDT_ENTRY           entry;
     DWORD               reserve;
 
-    hModule = GetModuleHandle16("KERNEL");
+    if (!(hModule = GetModuleHandle16("KERNEL"))) return FALSE;
     /* KERNEL.194: __F000H */
     sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(ULONG_PTR)194));
     wine_ldt_get_entry(sel, &entry);
@@ -528,6 +528,7 @@ void DOSMEM_InitDosMemory(void)
      * Set DOS memory base and initialize conventional memory.
      */
     DOSMEM_InitMemory(DOSMEM_dosmem + reserve);
+    return TRUE;
 }
 
 /******************************************************************

dlls/winedos/dosvm.c

@@ -703,7 +703,7 @@ BOOL WINAPI DllMain( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved )
     if (fdwReason == DLL_PROCESS_ATTACH)
     {
         DisableThreadLibraryCalls(hinstDLL);
-        DOSMEM_InitDosMemory();
+        if (!DOSMEM_InitDosMemory()) return FALSE;
         DOSVM_InitSegments();
 
         event_notifier = CreateEventW(NULL, FALSE, FALSE, NULL);