File Extensions

A File extension, also called a filename extension is usually 3 or more characters at the end of the computer file name. File extensions are useful for Windows or MAC OS, which can tell them what kind of data file it is and with which application associated it is. For example, HTML documents are identified by names that end with .htm (or .html), and GIF images by .gif may associated with photoshop.

There are over tens of thousands of file extensions at present, and it is not possible to know them all, when you met a unknown file type and you want to know what is and need open it, search the file name first, then choose the correct program to open it on your computer.

Common File ExtensionsNew Added Files