 Macintosh Type/Creator Database - http://homepage.mac.com/tcdb/ A database of windows file extension codes with correlating Macintosh Type/Creator code pairs. |
 DaubNET File Format Collection - http://www.daubnet.com/en/file-formats The full specifications of various file formats. |
 UK National Archives PRONOM Technical Registry - http://www.nationalarchives.gov.uk/PRONOM/ Resource for those requiring definitive information about the file formats, software products and other technical components required to support long-term access to electronic records. |
 Webopedia - Data Formats - http://webopedia.com/Data/Data_Formats/ Contains information about many data formats. |
 FILExt - http://filext.com/ Searchable database of file extensions for data formats, with information and notes on each. |
 Wotsit's Format - http://www.wotsit.org/ Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information. |
 Filerecon Project - http://www.computec.ch/projekte/filerecon/ Developing a program to automatically identify files from their content. Project news, FAQ, and download. [GPL] |
 Almost Every File Format in the World - http://www.ace.net.nz/tech/TechFileFormat.html Names many file formats and their extensions. |
 File-Extensions.org - http://www.file-extensions.org/ Searchable file extension list including descriptions and associated applications. |
 Uniblue File Extension - http://www.file-extension.com/ Searchable database of file extensions, explaining what they are used for and which programs they are associated with. |
 FileSuffix.com - http://www.filesuffix.com/ A searchable filename extension database. |
 FileInfo.com - http://www.fileinfo.com/ Database of file extensions with information about each file type. |
 Dot What?! - http://dotwhat.net/ Database of file extension information. Supports users comments and submissions. Includes discussion forum. |
 Sustainability of Digital Formats Planning for Library of Congress Collections - http://www.digitalpreservation.gov/formats/ Provides information about digital content formats from the viewpoint of maintaining sustainable and accessible archives. |
 File Formats Magic Database - http://www.magicdb.org/ Contains information on main file formats as well as an FFID registry and a signature file permitting the identification of files from their contents. Also contains tips on how to design new file formats. |