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» Almost Every File Format in the World    Names many file formats and their extensions.    http://www.ace.net.nz/tech/TechFileFormat.html

» DaubNET File Format Collection    The full specifications of various file formats.    http://www.daubnet.com/formats/

» Dot What?!    Database of file extension information. Supports users comments and submissions. Includes discussion forum.    http://www.dotwhat.net/

» FILExt    Searchable database of file extensions for data formats, with information and notes on each.    http://filext.com/

» FileInfo.net    Database of file extensions with information about each file type.    http://www.fileinfo.net/

» Macintosh Type/Creator Database    A database of windows file extension codes with correlating Macintosh Type/Creator code pairs.    http://homepage.mac.com/tcdb/

» Webopedia - Data Formats    Contains information about many data formats.    http://webopedia.com/Data/Data_Formats/

» Wotsit's Format    Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information.    http://www.wotsit.org/