Here is an audio file path in a project file:
[SAMPLE]
TYPE=FLEX
SLOT=001
PATH=…/AUDIO/ELEKTRON/percs.wav
TRIM_BARSx100=200
TSMODE=2
LOOPMODE=1
GAIN=48
TRIGQUANTIZATION=-1
[/SAMPLE]
I guess you have to copy your AUDIO folder in your new set to make projects work.
You can also try to copy all your files in the new set/folder.