There are literally dozens of programs that make use of the .key file extension, too many to list in this space. In the vast majority of cases the .key file is a system file containing the product key used to register a piece of software, or a configuration file used to store keyboard settings for various custom layouts. in the latter case, both Microsoft Windows and Mac OS support custom keyboard layouts and use the .key file for the configuration. In relation to the former use, some programs that use the .key extension for product key files include Avira Antivirus, Diablo II, Kaspersky Anti-Virus, and Craftsman National Construction Estimator.
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These files are usually found in the application's Program Files directory or the system folder of the operating system. The .key file can be opened by most text editors but the data is encrypted, making it useless. It is suggested that these files simply be left alone.
In addition to keyboard configuration files and product keys, there are six other verified associations reported for the .key file extension. They are listed below in no particular order, with as much detail as could be found.
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More Info Regarding File Extension Key
1. Apple's Keynote Presentation
Keynote Presentation is part of Apple's iWork productivity suite; it is the Apple presentation software similar to Microsoft's PowerPoint or the OpenOffice Presentation. Presentation projects are given the .key extension which is proprietary to the Apple software. At this time there appears to be no office suite that can import .key files, and no converters are available.
2.ArcView
ArcView is a program for plotting, analyzing, displaying, and managing geographic information. The .key file extension is assigned to files used in displaying a graphical interpretation of a lookup table. The files are written in plain ASCII text with the specific data needed by the lookup table written a single line at a time. The lookup table is coded to call up the .key file when displaying the information. These files can be opened, edited, and created from scratch using any standard text editor.
3.Bioware Aurora or Infinity Engine
Bioware is a video game developer with several engines including the Aurora and Infinity engines. All the files needed to run Bioware games and tools are packed into smaller files with the .bif extension. In order to keep track of what's in each .bif file, the software has .key files which act as a table of contents as it were. These .key files are vital to the operation of the game, as it would crash and burn without them.
4. Business Key Accounting
This accounting package is developed by an Arabic company under the name of Universal Systems. How the extension is used and to what its .key files contain is unknown.
5. DataCAD
DataCAD is an A/E/C CAD program for use by professionals in the architectural and construction industries. The .key file for this software is an internal configuration file containing information about custom icon tool bars. Users can create their own tool bars for different projects, including icons for various tasks. These custom tool bars are saved as .key files and are loaded from within the software. These files are proprietary to DataCad and cannot be opened by any other software.
6. Lotus Notes
IBM's Lotus Notes is a server/client collaboration tool used primarily for sharing email clients, calendars, and applications across a business server. Lotus uses the .key extension for its public key encryption files. Users of a particular Lotus network must all have the security key which is checked against the stored file on the server. Due to the the nature of this file, no further details have been made available.
Finally, six unverified associations have been reported for the .key extension including an OS/2 Archive and programs with the following names: Forecast Pro, Fractint, Thunder-Byte Antivirus, Sentry 2020, and Top Secret Crypto Gold file. No further details are available regarding any of this software.
