I agree with him (but TMPGenc works for mpeg-2 only in the 'Plus' version). Please note that 'joining' will not affect the quality at all, since the movies are copied 1:1 and are not at all re-encoded.
thank u guys..my problem was: i converted xvid movie to dvd files on DVDsanta..but before continuig copying the dvd i wish if i can make some chapters and menu for the dvd so i tried to open the mpeg files and they are 5 on dvdit or pinnacle studio but they didn't..that's why i wanna join them in 1 other file..maybe this file will open on dvdit. if u have any more ideas tell me pls