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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
HDS - Extension Details
Date Added: November 03, 2009
File Extension:  .HDS
Description 1: .HDS file extension is linked with XMap Hierarchical Dataset File. This is the file extension for the hierarchical dataset file utilized by XMap a program that provides users with powerful tools for managing XMap GIS databases. It also provides field technicians with efficient access to vital data layers. XMap is powerful and easytouse, and it is interoperable with MapInfo, AutoCAD and ESRI file formats. XMap is owned and developed by DeLorme.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: XMap
Common:
Extension: