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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:
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VCD - Extension Details
Date Added: January 01, 1970
File Extension:  .VCD
Description 1: VCD is short for Value Change Dump. It is the file extension associated with the data dump generated by various logic simulation application programs which is saved in text format. The files contain header info, variable definitions and value changes for specified variables. Value changes are presented in vector or scalar format, depending on the variabletype.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Altera Quartus II Unix: GTKWave
Common:
Extension: