2 m2v files and 2 ac3 files

[lollyruk]

ok new one for you all i backup my copy of austin powers3 but i used dvdxcopy and it split it onto two disks but i want to reencode it onto one disk (now i know how to) but i have to use my backup of austin powers 3 because someone destroyed my original.

so that means i have two ac3 files and two m2v files so how do i go about merging the files so i can reencode them and burn them onto one disk? I have searched through lots of websites but i still havent had much luck.