Fixed VerifyCab so it returns atUnknown instead of raising an exception if FDICreate succeeds but FDIIsCabinet does not.
Fixed VerifyCab so it returns atUnknown instead of raising an exception if FDICreate succeeds but FDIIsCabinet does not.

rburgstaler/tpabbrevia,rburgstaler/tpabbrevia,rburgstaler/tpabbrevia,rburgstaler/tpabbrevia,rburgstaler/tpabbrevia,rburgstaler/tpabbrevia