This was really helpful but there is a problem - in Step one when I click the arrow next to Details there is no button saying "apply to enclosed items" (at least none tht I can see - where is it?) This means although I can open the VIDEO_TS folder in MyDVDedit, it reads "some of the files are read only - you wll not be able to save chages". This means that although I can sucessfully change the aspect ratio to 4:3 on the VTS titles, when I try to save the change, the save option from the file menu is grayed out.
Any suggestions please? Thanks
Forget that, I have just minimised the get info window window and discovered "apply to enclosed items"