- Almost Every File Format in the World
 - Offers an exhaustive list of file formats and brief descriptions of what they are used for. - dataformato.com
- Overview of data formats ranging from data to file formats.
- Datapan.com
- Information on several formats of data including transmission, biological, media, text, audio, and video.
- Datfornet.com
- Features information on data formats, including MPEG, MP3, WAV, AVI, and image file formats.
- Dot What?!
- Collection of file extensions and formats. Resource website that provides detailed information about Microsoft Windows, Apple Macintosh, and Linux operating systems.
- File-Extensions.org
- Offers a large list of the filename extensions with detailed explanation of each file type, its file associations, and the way it is used.
- FileSpecs.com
- Dedicated to helping developers, gamers, and techno-enthusiasts find and use binary file formats, definitions, and specifications.
- FILExt
- File extension source with an A-Z list of common file extensions and the programmes with which they open.
- InfoFormat
- Data format resource guide discussing HTML, PDF, WOL, SMIL, and VRML.
- NTFS.com
- Offers detailed specifications of NTFS and FAT file systems and hard disk drive basics in addition to data recovery software.
- Open eBook
- Initiative to establish a specification for eBook file and format structure based on HTML and XML.
- Uncanny Programming
- Includes tutorials on CSS, XML, and DHTML.
- WhatIs.com: Every File Format in the World
- A list of file name extension or suffixes that indicate the format or usage of a file and a brief description of that format.
- Wotsit's Format
- Programmer's resource for detailed file format and data format information.
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