- .dot WHAT?
- File extension information resource. Covers all file formats used in Microsoft Windows, Mac OS X, and Unix based operating systems.
- File-Extensions.org
- Extensive collection of lists and information on file extensions for different platforms.
- FileInfo.com
- Online source for information about text, data, image, audio, video, web, system, plugin, executable, encrypted, backup, and game file formats or extensions.
- Filesuffix.com
- Online filename extension database with answers to typically asked questions about file extensions.
- FILExt
- Serves as a guide to identifying or knowing what a particular file format is.
- Uniblue File-Extension
- Free online file extension library with free PC utilities.
- Wotsit.org
- File and data format resource for programmers. Presents specifications, examples, and references.
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