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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
SDC - Extension Details
Date Added: January 01, 1970
File Extension:  .SDC
Description 1: .SDC is the extension tied to the Smart Diary Suite configuration. The .SDC files used by the Smart Diary Suite contain configuration. Smart Diary developed a new way of keeping a journal of a users life. Having been around since 1997, the Smart Diary Suite has made it possible for users to closely monitor their lives using various parameters that allow for plotting on graphs, showing how they are related to each other and other entries.
File Type:   Configuration file
Mode: Binary
Program(s) to Open:  Associated application: Smart Diary Suite from Programming Sunrise
Common:
Extension: