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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
USR - Extension Details
Date Added: January 01, 1970
File Extension:  .USR
Description 1: File extension .USR is linked to Daqarta Extended Audio Data. Daqarta taps into the users Windows soundcard to deliver highperformance waveform as well as FFT spectrum analysis, signal averaging, advanced personal or lab use options, color spectrograms, and signal generation. Use the .USR file format in opening saved files along with standard WAV files gathered elsewhere; analyzing spectrogram, waveform or spectrum file data displays. Many unsupported file formats can also be opened through format parameters manual selection.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Open with Daqarta Extended Audio Data program
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