.TDF File Extension

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.

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.

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.

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