Вот нашел описание :). Это для случая, когда сам фильм в VTS_01.
Using IFOEDIT
After copying your DVD files to hard disk folder
Click Open, browse to the VIDEO_TS folder, click on the VTS_01_0.IFO file
Click on VTSI_MAT, in the bottom window and scroll down to 00000200 and double click on it.
Change the aspect ratio to 16:9 and click OK
Click Save
When asked if you want to change the BUP file, click Yes.
Close IFOEdit.
If you want to change menu to 16:9
The VIDEO_TS.IFO in the same folder file corresponds to the menu, you edit this file.
You do the same thing, only click on VMGM_MAT, and scroll down to 00000100 and not 00000200.
Now burn the files to DVD with a burning application (example NERO)
http://www.videohelp.com/tools?tool=IfoEdit