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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
ORI - Extension Details
Date Added: January 01, 1970
File Extension:  .ORI
Description 1: File extension .ORI is associated with the Original File. It is usually added to files that already have file extensions. The .ORI extension may be attached to a filename like "page1.html, becoming "page1.html.ori. This type of file comes in handy when differentiating between backup (.BAK) and original files. For files to open properly, consider taking out the .ORI extension.
File Type:   Backup file
Mode: Binary
Program(s) to Open:  Mac and Windows: open with the program that created the file
Common:
Extension: