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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
URD - Extension Details
Date Added: January 01, 1970
File Extension:  .URD
Description 1: Extension .URD relates to the Ultra Recall Database. Ultra Recall is knowledge, document and info management program software for Microsoft Windows. The URD file format aids in capturing, organizing and recalling all of a users electronic info and documents across all applications that were utilized. Ultra Recall uses the open source SQlite database engine, with a few modifications to allow support for stored content storage and encryption.
File Type:   Database file
Mode: Binary
Program(s) to Open:  Open with Ultra Recall Database program from Kinook Software, Inc.
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