.tar - Tape Archive. Used for archiving files on a UNIX system. .tar is not used for compression purposes.

.taz - TAR compressed archive.

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.tcw - TurboCAD Drawing (IMSI/Design LLC).

.tddd - Three D Data Description. Used by Turbo Silver for 3D rendering data. The files contain object and (optionally) observer data.

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.text - ASCII Text.

.tga - Targa file format. An image format designed for systems using Truevision video boards -- supported by MS-DOS platforms.

.thm - Theme file used by Sony Ericsson mobile phones; stores settings used to customize the user interface of the cell phone; includes custom window and text colors, icons, wallpaper, and other images; can be created and edited using the free Themes Creator from Sony Ericsson. (file extension)

.tif, .tiff - Tagged Image File Format. Used to exchange documets between different applications and platforms.

.tly - Photoshop Elements Backup Catalog File (Adobe Systems Incorporated).

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.tpl - Template format. Used as a standard for other similar files to follow.

.ttf - True Type Font format. Type of font created by Apple Computer and used with the Macintosh and Microsoft Windows operating environments.

.txt - Text file format. Used to view text files on PC platforms.

.tax - TurboTax data file.

.t01 - t05 - TaxCut, Tax Return File (H&R Block e-solutions).