A list of Open32 bugs (under construction):

- Key mapping problem. Cursor key messages (WM_KEYUP/DOWN) contain the wrong
  OEM scancode (should be the same as the numeric keypad arrow keys)
  Make that: extended key mappings are totally messed up
- No support for CBS_OWNERDRAWFIXED or CBS_OWNERDRAWVARIABLE styles (COMBOBOX)
- Crash if CBS_OWNERDRAWFIXED && !CBS_HASSTRINGS and sending CB_ADDSTRING with
  attached item data (i.e. PERFMON sends 0,1,2,3,4 and PM treats this item data
  as pointers)
- Crash in PMWINX if the app isn't PM
- Open32 isn't sending WM_NCCREATE msgs
- HK_CBT hook not supported
- HK_GETMESSAGE hook crashes in PMWINX
- UpdateWindow sends a WM_ERASEBKGRND when it shouldn't
- Open32 doesn't send a WM_ERASEBKGND when a window is activated
- HeapCreate with dwMaximumSize == 0 seems to reserve only 64 kb memory
  instead of 'unlimited'. Makes Win32 heaps impossible to use.
- CreateDialogParamA can have a dlgproc set to NULL -> PMWINX crash
- GetObject doesn't return the pointer to the bitmap data (always 0)
- GetFileType returns FILE_TYPE_UNKNOWN for file handles
- WriteFile with nrbytes = 0 should SetEndOfFile Open32 does not. (Notepad95)
- GetDeviceCaps -> NT returns -1 when using 16 bits colors, NOT 65536!
- File handles returned by _lopen & _lcreate are 32 bits; Windows returns
  handles with only the least significant 16 bits filled.
- Wrong calling convention for Win32 apis (_System instead of _stdcall or for
  some apis _cdecl)
- Wrong calling convention for callback handlers (_System instead of _stdcall)
- Wrong calling convention for hook handlers (_System instead of _stdcall)
- RegOpenKeyEx doesn't set the HKEY pointer (5th argument) to zero when an
  error occurs. Some applications depend on this to do error checking.
- RegSetValueA crashes in pmwinx.dll if the size parameter is 0 and the string
  is very large.
- CreateDIBSection does not flip bitmaps is vertical or horizonal size is
  negative.
- Default window message handlers (i.e. DefWindowProcA) don't properly support
  some messages (i.e. WM_CTLCOLOR*)
- GetSystemMetrics far from complete
- SystemParametersInfoA incomplete
- GetWindowLong returns 0xffff for GWL_ID. This should be 0xffffffff.
- Open32 doesn't send any WM_PARENTNOTIFY messages
- Open32 doesn't send WM_SETCURSOR or WM_MOUSEACTIVATE to parent windows
- CS_SAVEBITS: window movements are slow, many repaints
- SetROP2 with R2_XORPEN doesn't work. Example:
    hOldPen = SelectObject (hdc, GetStockObject (BLACK_PEN));
    oldRop = SetROP2 (hdc, R2_XORPEN);
    MoveToEx (hdc, x, rect.top, NULL);
    LineTo (hdc, x, rect.bottom);
    SetROP2 (hdc, oldRop);
    SelectObject (hdc, hOldPen);
- FillRect uses the wrong color sometimes; see menu code (MENU_DrawMenuItem)
- Wrong return values for GetDIBits & SetDIBitsToDevice
  (nr of scan lines copied; not true/false)
- SetDIBitsToDevice can't handle compressed bitmaps (presumably all other
  bitmap apis as well)
- Workaround added for bugs in Open32's SetDIBits; messes up colors for 1 bpp bitmaps
  (reversing scanlines and calling SetBitmapBits works, but only if the all scanlines are updated!)

Limitations:
- No support for COMCTL32 controls.
- Many Win32 apis not included.
- Many apis have extensions in Win9x & NT 4 that are not supported.
- No support for Win9x & NT 4 extended dialog styles.
- Profile apis don't use ini files.

General problem:
- Can't extend Open32 easily without knowledge of internals