What is a FAT file?
A .FAT file has multiple different uses in computing. Most commonly, it acts as a game data archive or index file. Video games that use the Ubisoft Dunia Engine (like Far Cry 3) and CryEngine rely on .FAT files to store game assets. The game Driver: San Francisco also uses them for game data archives. Rockstar Games uses .FAT files as a game sound file index.
Alternatively, a .FAT file can be a raw disk image or data file formatted with the Microsoft File Allocation Table file system, often associated with MS-DOS and created using command-line tools like `mkfs.fat`. Finally, a .FAT file might be a Zinf Theme File created by The Zinf Team to customize the appearance of their media player.
How to open FAT files?
Because the .FAT file extension has multiple meanings, you must know what kind of file you have. You can mount Microsoft disk images using system tools or software like OSFMount. Game archives usually require specialized extraction tools built by modding communities, or general archivers like 7-Zip. Sound index files often open with audio software like GoldWave.
If you are unsure about your file, viewer.online/fat analyzes .FAT files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Best practices and conversion
If you need to edit or view the contents in standard software, you should convert the data. We recommend file conversion to sensible target formats on convert.guru. Depending on your specific file type, you can convert disk images to standard .ISO files, or extract game audio tracks into .WAV files.
Summary
Since the format varies significantly depending on the source, viewer.online/fat directly opens and previews .FAT files in the browser, eliminating the need to install software or troubleshoot compatibility issues.