| Wotsit.org ~ http://www.wotsit.org/ File and data format resource for programmers. Presents specifications, examples, and references |
| FILExt ~ http://filext.com/ Serves as a guide to identifying or knowing what a particular file format is. |
| FileInfo.com ~ http://www.fileinfo.com/ Online source for information about text, data, image, audio, video, web, system, plugin, executable, encrypted, backup, and game file formats or extensions. |
| .dot WHAT? ~ http://dotwhat.net/ File extension information resource. Covers all file formats used in Microsoft Windows, Mac OS X, and Unix based operating systems. |
| Uniblue File-Extension ~ http://www.file-extension.com/ |
| Filesuffix.com ~ http://www.filesuffix.com/ Online filename extension database with answers to typically asked questions about file extensions. |
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