Determine if the PSD is valid for the current platform.
This function will load the specified PSD, call its Install, and DeInstall
routine, and unload the PSD. It returns the return code from the PSD's Install routine, or any error code it might have received while attempting to do the above operation.
Pointer to a fully qualified PSD path and name.
This function will mainly be used by OS/2's install, to test the validity of a PSD that will be installed.