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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
NDX - Extension Details
Date Added: September 10, 2008
File Extension:  .NDX
Description 1: The .NDX extension has to do with the dBASE Index file. It deals with the index file defining the fields and structures of a database. These files feature a header that is followed by a Btree. The Btree contains the leaf, root and branch nodes. .NDX files are mainly used by dBASE, but other database programs may also be able to recognize them.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: dataBased Intelligence dBASE, Microsoft Fox Pro, other xBasecompatible software
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Extension: