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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
T07 - Extension Details
Date Added: January 01, 1970
File Extension:  .T07
Description 1: File extension .T07 is linked to the TaxCut 2007 Tax Return. It refers to tax returns for tax year 2007 in the United States. The TaxCut 2007 software generates the .T07 files. Each .T07 file has tax forms with numeric values and fields that users fill in themselves. Keep in mind that only the TaxCut version that created the TaxCut returns can be used to open them.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: H&R Block TaxCut 2007
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Extension: