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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
XDB - Extension Details
Date Added: January 01, 1970
File Extension:  .XDB
Description 1: An .XDB file extension indicates the file has info on a PowerDesigner database file (.PDM). It may refer to the default definition file that comes included in PowerDesigner, but it could also be a custom file that a user created. The .XDB extension is required for PowerDesigner database files to open correctly.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Sybase PowerDesigner
Common:
Extension: