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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
D64 - Extension Details
Date Added: January 01, 1970
File Extension:  .D64
Description 1: .D64 file extension is linked with Commodore 64 Disk Image. It is a disk image file that is saved using a Commodore 64 disk. The Commodore 64 [C64] used to be a popular PC name during the 80s. .D64 file is also referred to as Commodore emulator file of one of the following disk types: VC1541, CBM2031, CBM3040 or CBM4040.
File Type:   Plugin File
Mode: ASCII
Program(s) to Open:  Windows: CCS64, Frodo, Star Commander, WinVICE; Mac: Frodo, Power64, Vice
Common:
Extension: