bool __fastcall PnpIsValidGuidString(PCWSTR SourceString){
_UNICODE_STRING DestinationString;
_GUID Guid;
DestinationString = 0i64;
Guid = 0i64;
return RtlInitUnicodeStringEx(&DestinationString, (WCHAR *)SourceString) >= 0
&& (DestinationString.MaximumLength & 0xFFFE) == 78
&& RtlGUIDFromString(&DestinationString, &Guid) >= 0;
}