Names many file formats and their extensions.

The full specifications of various file formats.

Database of file extension information. Supports users comments and submissions. Includes discussion forum.

Database of file extensions with information about each file type.

Searchable database of file extensions for data formats, with information and notes on each.

A database of windows file extension codes with correlating Macintosh Type/Creator code pairs.

Contains information about many data formats.

Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information.