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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
JAS - Extension Details
Date Added: February 09, 2008
File Extension:  .JAS
Description 1: .JAS file extension is linked with Paint Shop Pro Compressed Graphics. JAS format files involves the smallest possible files for 8bit gray scale images or 24bit pixelled color images. This application uses discrete cosine transformation to change image data before compression; allowing substantial reduction in file size when saving the image. .JAS file extension is associated with Corel PaintShop Pro from Corel Corporation.
File Type:   Bitmap image file
Mode: Binary
Program(s) to Open:  Windows: Corel Paint Shop Pro
Common:
Extension: