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"Every File Extension in the World"

This is a list of file extension names or suffixes that indicate the format or usage of a file and a brief description of that file extension. In general, if you have the program that uses that file extension, that program can be used to open or otherwise use the file.

Many people have contributed to this list and we thank them! If you know of file extensions that should be added to this list, please e-mail us and we'll add them.

 File Extension Listing for "#":
Browse File Extensions Alphabetically:  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #
000Data file (GEOWorks)
000-20009Used to number old (backup) versions of files (for example, CONFIG.SYS when changed by an installation program); also used to number related data files for multiple users of a small-scale PC application
001-999Database index files used by (Superbase)
113Backup data file (Iomega Backup)
1STDocumenting wizard list (Microsoft Visual FoxPro)
3DR3DMark Benchmark File
7z7-Zip open source file archive format with high compression ratio
8Source file (Assembly) (Similar to Microsoft Assembler)
netCDFNetwork Common Data Form
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Browse File Extensions Alphabetically:  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #
Current file name extensions and definitions as of 11/7/2009: 3536

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