Almost Every File Format in the World
Names many file formats and their extensions.
DaubNET File Format Collection
The full specifications of various file formats.
Database of file extension information. Supports users comments and submissions. Includes discussion forum.
Database of file extensions, file conversions and software to work with unknown file extensions
A searchable database of thousands of file extensions, with information about the most common Windows applications used to open them.
File Extension Database
Database of file extensions. Detailed instructions on how to open files in different formats.
Alphabetical list of file extensions for Dos, Windows, Unix, Mac. More than 10.000 entries. Extensive information on each file format. List of graphic file formats. List of potentially dangerous file formats. Many downloadable freeware converter programs.
File Formats Magic Database
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.
Searchable file extension list including descriptions and associated applications.
Contains detailed descriptions of thousands of file formats and shows the user which products can open them.
A regularly updated filename extension resource site.
Contains information about file extensions.
File extension database. Helps to open unknown file types for inexperienced computer users. A large list of programs to open any file type from the database.
Database of file extensions and detailed information about such file types, including software that can be used to open them.
Source for file format standards, online file conversions, and detailed file specifications, including Unicode characters, MIME types and file extensions.
Database of file extensions with information about each file type.
Developing a program to automatically identify files from their content. Project news, FAQ, and download. [GPL]
A searchable filename extension database.
Searchable database of file extensions for data formats, with information and notes on each.
File extensions database.
List of File Types
Comprehensive list of file types ordered by file extension, with links to relevant sites for additional information where known.
A comprehensive file format database that provides users with recommended applications for opening specific file formats.
The PC Pitstop File Extension Library
Can be used to find a program that can open unkown file types.
Sustainability of Digital Formats Planning for Library of Congress Collections
Provides information about digital content formats from the viewpoint of maintaining sustainable and accessible archives.
UK National Archives PRONOM Technical Registry
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.
Uniblue File Extension
Searchable database of file extensions, explaining what they are used for and which programs they are associated with.
Webopedia - Data Formats
Contains information about many data formats.