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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
YBHTM - Extension Details
Date Added: January 01, 1970
File Extension:  .YBHTM
Description 1: Extension .YBHTM is associated with an eBook reader that loads web pages (including those direct from Net addresses) and text files. It reformats them, producing paperbacks for use in screen reading. YBHTM files also feature printout routines to generate hard copy and booklets for binding, along with a compiler for generating a users own ebook for possible distribution. yBook has registered the .YBHTM extension to avoid confusing it with .HTM files that might be registered on a users system.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Associated with Spacejock Software
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