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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
ROI - Extension Details
Date Added: January 01, 1970
File Extension:  .ROI
Description 1: .ROI is the file extension tied to the Report Object Instance type of file. It is attached to files concerning info objects that the Actuate reporting program software uses. The .ROI file format is able to pull as well as integrate realtime data from the many different sources of data.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Actuate Information Object Designer or other compatible Actuate software
Common:
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