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.TDF File Extension


File Type 1 Guide Text Definition File  (Most common)
File Format File
Common? No
File Description Contains definitions of datasets used by a Guide, a star charting and desktop planetarium program; may be included on the application CD or saved on the hard disk during a program installation.

Text definition files can be modified in a text editor.
Program(s) that open tdf files Windows: Project Pluto Guide

File Type 2 Xserve Test Definition File
File Format Proprietary File
Common? No
File Description Stores test instructions and parameters for system tests run by Xserve Remote Diagnostics; used for testing the performance of components in an Apple Xserve server computer; can be edited in a text editor.
Program(s) that open tdf files Mac: Apple Xserve Remote Diagnostics

File Type 3 Title Definition Format File
File Format Proprietary File
Common? No
File Description Contains setup instructions for backing up DVD movies; used by DVD X software such as DVD-X Copy, DVD X Platinum, and DVD X Copy Express; may be used to modify and fix DVD authoring problems and incorrect titleset selections made by the DVD X software.

321 Studios has ceased operations for legal reasons.
Program(s) that open tdf files Windows: 321 Studios DVD X Copy software

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/tdf