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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
VI - Extension Details
Date Added: January 01, 1970
File Extension:  .VI
Description 1: VI files are linked to a scientific testing and measurement program application that LabVIEW created. "Virtual instrument is how some refer to the .VI file owing to its ability to copy the appearance as well as operation of a particular physical instrument like an oscilloscope or a multimeter. Users have two options when creating virtual instruments: they can do it from scratch or have them built from the VI templates that come included in the LabVIEW software.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Macintosh, Windows and Unix: National Instruments LabVIEW
Common:
Extension: