There you go:
http://www.google.co.uk/search?q=file+format+list&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Edit: not sure what you mean by officially recognised
Type: Posts; User: mike_g
There you go:
http://www.google.co.uk/search?q=file+format+list&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Edit: not sure what you mean by officially recognised