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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
S19 - Extension Details
Date Added: January 01, 1970
File Extension:  .S19
Description 1: .S19 is the file extension linked to the Motorola EEPROM programming file. It is a Motorola hex file extension used by the firms electronic programmers (not people) in programming microcontrollers which had the EPROM on board. The .S19 files are actually text files that contain the targeted controllers hex code.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Associated application: NotePad++ from Notepad++ Team
Common:
Extension: