Thanks yes I dragged and dropped the dat file onto the original one and it opened a new window.
I'm comparing the two files now...
I'm trying to see which will be transferred if possible...
What does File offset mean?
Also I've exported obj from one dat file and imported it to another. I've save it as and obj and loaded it as and obj and it worked. I see the mapping now is identical. Have I done it right? chunk size and data size don't match is that a bad thing?