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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
SDF - Extension Details
Date Added: January 01, 1970
File Extension:  .SDF
Description 1: The .SDF file extension refers to the standard database format. Use it to store data in a structured format. An .SDF file utilizes fields bearing fixed lengths to keep or save values. Various data analysis and database programs are able to import and export these files. .SDF extensions and format come in handy when transferring data between and among different applications.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: DataBAsed Intelligence dBASE, ChemDBsoft, Pervasive PSQL, Rosenvick AspireGold
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