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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
T05 - Extension Details
Date Added: January 01, 1970
File Extension:  .T05
Description 1: File extension .T05 is linked to TaxCut 2005 Tax Return. It is attached to US tax returns for tax year 2005. The tax preparation program called TaxCut 2005 created the .T05 files. Field values contained in the tax forms included in .T05 files are filled in by users. The way to open TaxCut returns is to use the same TaxCut version that was utilized to create the files.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: H&R Block TaxCut 2005
Common:
Extension: