file specs database

Blitz3D Forums/Blitz3D Programming/file specs database

Does anyone know of a file specs database?
i want to add some more export options to T.Ed.

Most importantly i want to save to X format with the following: child meshes with surfaces & vertex alpha.

Also i was planning to look into:
3DS (if it can support vertex alpha (not sure))

http://www.wotsit.org/ is often mentioned.