Calling SetThemeAppProperties with argument which has flag STAP_ALLOW_CONTROLS unset causes CoCreateInstance for Common Dialogs (or at list File Open Dialog, CLSID_FileOpenDialog) to return error 0x80040111.
Sample code is following:
HRESULT hResult; CComPtr< IFileOpenDialog > pFileOpenInterface1; CComPtr< IFileOpenDialog > pFileOpenInterface2; hResult = ::CoCreateInstance( CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pFileOpenInterface1 ) ); ::SetThemeAppProperties( 0 ); hResult = ::CoCreateInstance( CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pFileOpenInterface2 ) );
To make it into running code I have created (in Visual Studio 2010 Professional) a simple Win32 GUI application and added that code to menu Help|About handler.
Why is it so and how to work around that issue?