What are they:

General presets are files that can be created with WinDVD Tweaker to store WinDVDs settings. The files carry the file extension ".dvd" and can be loaded from within WinDVD Tweaker or by double clicking them from outside WinDVD Tweaker.

Most general, audio and video settings are stored within these files. If there is a setting that does not save, and you would like it to be saved please contact me.

Extension:

.dvd