Thought current DSS provide near 400 file type support, but many cases customer exist special file type that current product didn't supported. So I want to add a feature request is:
[Provide Custom File Type Analysis Wizard/Tool like Symantec DLP ]
Symantec had provide a tool named [File Type Analyzer utility], to help customer add the custom filetype by them self.
ref: http://www.symantec.com/business/support/index?page=content&id=TECH218595
Hope Websense also can provide the similar tool to fulfill requirements.