List of Data Formats and Extensions

All the file extensions in one website. Help guide to know what is a data format about and how can you open files from a specific format. A helpful information site that is dedicated to describing computer file formats and how they relate to formats mainly on Microsoft Windows platform and other operating systems like Apple Mac OS X or Linux/Unix.

Popular Searches


Complete list

See the complete formats list


Search by Letter




A computer filename extension is usually a three or more letters combination added to the end of name and separated by a dot character. It indicates the encoding convention (format and type) of its contents. Operating system like Microsoft Windows registers and associates it to a program(s). You can then by using some files manager (Windows Explorer, Total Commander, Apple Finder etc.) operate with file simple double-clicking at it and you can view, open and edit, play, convert or extract desired type specified . The operating system does default action based on registered files format extensions, installed applications or custom user settings – by default, it runs default application. For example: by clicking on music file (usually mp3 ) it opens default player and play the music.



How to Display at your Windows operating system

By default, Windows is configured to hide file formats, the (usually three-leter) portion of the filename following the period. Aside from creating a knowledge gap between experienced and inexperienced users, this “feature” also can make it difficult to differentiate files with the same filename prefix.

To display at your Windows follow these steps:
– Open My Computer, and select Folder Options from the Tools menu (or choose Options from the View menu in Windows 95). If you don’t see horizontal top menu, pressing Alt key may help to show it.
– Click on the View tab and turn off Hide for known file types, and press OK.