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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
HDMP - Extension Details
Date Added: January 01, 1970
File Extension:  .HDMP
Description 1: .HDMP file extension is linked with Windows Heap Dump. This is the uncompressed error dump file created by Windows XP/Vista when an application crashes or experiences an error. It carries the "dump state of the application when the error occurred and other significant system data recorded upon the occurrence of the error. The compressed Heap Dump files are saved as .MDMP [Minidump] files and may be sent as an error report to Microsoft for bug fix.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: this file should not be opened manually or in any other way by the user
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