AFAIK HINSTANCE is defined through(ref: Microsoft document):

typedef PVOID HANDLE;
typedef HANDLE HINSTANCE;

But why I can’t use PVOID when defining _tWinMain?

int WINAPI
_tWinMain (PVOID hInstance, PVOID hPrevInstance, PTSTR pCmdLine, int nShowCmd)

gcc says:

error: conflicting types for 'WinMain'; have 'int(void *, void *, CHAR *, int)' {aka 'int(void *, void *, char *, int)'}
   64 | _tWinMain (PVOID hInstance, PVOID hPrevInstance, PTSTR pCmdLine, int nShowCmd)
      | ^~~~~~~~~

mingw64x86_64-w64-mingw32includewinbase.h:1111:14: note: previous declaration of 'WinMain' with type 'int(struct HINSTANCE__ *, struct HINSTANCE__ *, CHAR *, int)' {aka 'int(struct 
HINSTANCE__ *, struct HINSTANCE__ *, char *, int)'}
 1111 |   int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd);
      |              ^~~~~~~

I’m using mingw from winlibs 11.2 in Windows 10(64 bit).

FYI, in my mingw64x86_64-w64-mingw32includewtypes.h of winlibs:

typedef void *HINSTANCE;