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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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CF - Extension Details
Date Added: February 03, 2009
File Extension:  .CF
Description 1: .CF file extension is linked with Sendmail Configuration File. This is the file extension for the configuration file utilized by Sendmail a mail transfer agent or MTA which supports many types of mail transfers and delivery such as the popular SMTP. Sendmail is a descendant of the program developed by Eric Allman namely Delivermail. It is a popular project of Unix communities and the free and opensource software, and it is distributed as proprietary and free software.
Description 2: .CF file extension is linked with Imake Configuration File. It is an old file extension and a discontinued build automation system that was implemented on top of C preprocessor. Imake creates makefiles from a set of CPP macro functions, a template, and perdirectory input file [Imakefile]. This process allows machine dependencies from item build descriptions.
Description 3: Windows: Cerius2.CF file extension is linked with CFwin Project File. This is the file extension for the project file created and used by CFwin an application designed for heat balance and/or refrigeration needs of specific facilities. Teams are usually selected from the estimation data to cover the necessary refrigeration/heat requirements. CFwin is owned and developed by ProcedimientosUno SL.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: CFwin
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