- Almost Every File Format in the World - Names many file formats and their extensions.
- DaubNET File Format Collection - The full specifications of various file formats.
- Dot What?! - Database of file extension information. Supports users comments and submissions. Includes discussion forum.
- FileInfo.net - Database of file extensions with information about each file type.
- FILExt - Searchable database of file extensions for data formats, with information and notes on each.
- Macintosh Type/Creator Database - A database of windows file extension codes with correlating Macintosh Type/Creator code pairs.
- Various File Formats and How to Deal With Them - Includes descriptions and suggestions for software (free and pay) that handle them on Windows and MacOS.
- Webopedia - Data Formats - Contains information about many data formats.
- Wotsit's Format - Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information.
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