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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:
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HDR - Extension Details
Date Added: June 11, 2008
File Extension:  .HDR
Description 1: .HDR file extension is linked with PcFile+ Database Header. This is the file extension for the database header utilized by PcFile+ a flat file database application that mostly runs on DOS. It was one of the first widelypopular software programs sold via shareware. It was originally developed by Jim "Button Knopf in late 1982. He later formed Buttonware to develop, market and support PcFile.
Description 2: .HDR file extension is linked with MicroSim PCBoard HoleDrill Schedule Report. This is the file extension for the holedrill schedule report utilized by MicroSim PCBoard. .HDR file extension is also associated with OrCAD PCB Designer a fullyintegrated design flow program that includes: design capture technology, constraint manager, auto/interactive router, PCB editor, component tools, and manufacturing and mechanical CAD interfaces. OrCAD PCB Designer is owned and developed by Cadence Design Systems, Inc.
Description 3: .HDR file extension is linked with Procomm Plus Message Header. This is the file extension for the message header file utilized by Procomm Plus a shareware application during the early preweb days. This application allows users to dial into BBS, telnet and many others. Procomm Plus is also a terminal emulator that offers support for 3 dozen terminals. It has fax applet, email program, Usenet news reader and FTP ability. Procomm Plus is owned and developed by Symantec Corp.
Description 4: .HDR file extension is linked with InstallShield Setup Header. This is the file extension for the setup header utilized by InstallShield the industry standard for InstallScript and Windows Installer installations. The 2008 version of InstallShield allows software developers of all sizes create highquality installations for Windows platforms and extend them in order to configure web services, mobile devices and database servers.
Description 5: .HDR file extension is linked with ArcInfo Binary File. This is the file extension utilized by the binary files created by ArcInfo a complete desktop GIS for GIS professionals from ESRI. Among its many features include: provides users with complete tools to develop and manage a complete and intelligent GIS [which includes maps, globes, metadata, data, workflow models and geodatasets], advanced spatial analysis, highend cartography tools and extensive data manipulation. ArcInfo also offers userfriendly interface which is customizable and extensible all the way through scripting, modeling and other applications.
File Type:   Binary File
Mode: Binary
Program(s) to Open:  Windows: ArcInfo
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