If an application passes an invalid window handle to the MessageBox API, and the lower 16 bits of that handle are NULL, Windows ...

If an application passes an invalid window handle to the MessageBox API, and the lower 16 bits of that handle are NULL, Windows 9x treats it as the desktop (because window handles are only 16 bit on Windows 9x). On Windows XP, since the full 32 bits are used, the call to MessageBox would fail. This compatibility fix intercepts the MessageBox API and determines if the window handle that was passed is a valid handle. If it is not valid, it is set to NULL.

If an anti-spyware product is installed and functioning configure Security Center to stop monitoring anti-spyware status. ... If an app doesn't shut down gracefully, customers can lose data when the OS forces the shutdown. Not responding to system ... If an application calls PlaySound with a SND_LOOP flag, the sound plays continuously until PlaySound is called with a NULL ... If an application calls the FindFirstFile API on a directory, and then attempts to remove that directory without first closing ... If an application passes an invalid window handle to the MessageBox API, and the lower 16 bits of that handle are NULL, Windows ... If an I/O error is returned which is not defined in the standard FsRtl filter, it is converted to the following error which ... If an item is \"offline\", indicates why it is offline. 0 - Unknown. Unable to determine reason. 1 - Not applicable. Item ... If an MM error is returned which is not defined in the standard FsRtl filter, it is converted to one of the following errors ... If an MM error is returned which is not defined in the standard FsRtl filter, it is converted to one of the following errors ...