Hello, 
We get an exception when trying to index an old Doc file: 
GroupDocs.Parser.Exceptions.GroupDocsParserException: The Document appears to be corrupted and cannot be loaded.
   at .(Stream , LoadOptions )
   at .(N…...GroupDocsParserExcep when indexing very old doc file GroupDocs.Search Product...when trying to index an old doc file: GroupDocs.Parser.Exceptions...