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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
OND - Extension Details
Date Added: January 01, 1970
File Extension:  .OND
Description 1: .OND files are associated with the Lotus Notes Encapsulated Memo file. An .OND file extension refers to files containing plain text messages or memos that were created using Lotus Notes. IBM developed the Lotus Notes email and organization program. The OND files are saved in "minimalist format, featuring only the default view, and are optimized for transport efficiency.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: IBM Lotus Notes
Common:
Extension: