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Researching Graphics File Format Extensions
Resources for identifying graphics file types by their file extension. Includes file extension references and searchable databanks of graphics file formats.
DotWhat!? File Extension resource
"This site is based on a huge database offering file extension information, mainly (but not exclusive to) the Microsoft Windows, MAC OS X and Unix based operating systems."
Every File Format in the World
A list of file name extensions with a brief description of that format and sometimes a link to more information about a particular format.
FileInfo.net - The File Extensions Resource
"FileInfo.net contains a searchable database of file extensions with detailed explanations of each file type. Every file extension entry contains information about the file format, a description of the file, and how to open the file. Programs for opening the files are listed for both the Macintosh and Windows platforms."
FILExt - The File Extension Source
FILExt is a detailed database of file extensions and programs that use them.
Wotsit's Format Search
A searchable resource of information on hundreds of formats. Also includes specifications, source code, algorithms, and other information for programmers.