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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
XGS - Extension Details
Date Added: January 01, 1970
File Extension:  .XGS
Description 1: File extension .XGS is associated with a "disk image file that contains every single data byte on a diskette files, catalog tracks, DOS (when present) and others. NIB is a kind of disk image attempting to preserve all disk info like sync bytes, sector headers and so on). Apple II emulators that run on Macs and PCs treat the disk image files like diskettes. Disk images is one means of archiving Apple II disks on a hard disk and maintaining wares on FTP as well as other download websites. These images are often 800K in size (similar to the more recent 2IMG format), and represent an older proprietary format employed by earlier XGS versions. 2IMG Universal Format has superseded the XGS format.
File Type:   Disk Image [ISO] Binary
Mode: Binary
Program(s) to Open:  Associated application: Apple IIGS emulator XGS from Joshua M. thompson Public ports available for Windows 95 and NT, Mac OS, MSDOS and Unix
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