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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
I01 - Extension Details
Date Added: May 12, 2008
File Extension:  .I01
Description 1: .I01 file extension is linked with DVD Shrink Part 2 File. This is the 2nd file of a disk image file group saved by DVD Shrink an application that compresses DVDVideo data to fit a DVDR disc. It is typically saved as a part of a file sequence [i.e. .I00, .I01, .I02, etc.] .I01 files are saved with corresponding .MDS files which defines the discs data structure.
File Type:   Disk Image [ISO] Binary File
Mode: Binary
Program(s) to Open:  Windows: Alcohol 120%, DVD Shrink, Daemon Tools
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