Pete, thanks for replying.
I did burn it onto disc and it is out of sync on the disc on a standalone player, the disc when played on the computer and the original files on the PCs HD.
I reduced each disc (movie only) with D2O, saved each to a folder, both folders together = 4200MB.
I then joined the two.
Its interesting that LOTR: TTT worked ok using the same procedure.
I must say the quality of the picture is excellent: no pixelation.
I shall try again.
To be honest, both 2 disc sets I used were themselves copies of originals. So I think my next step is to try using original-original discs. Though all the original-copies played ok themselves.
I shall persevere, it’s just handy to have the extended version on one disc.
Many thanks, and this forum is brilliant!