Switching from MYOB company file to another

Am lookingf or help.  We have sold our business and I am helping the new owner set up the opmetrix sales tablets which automatically send invoice data to AR live.

Unfortunately, the UID has chnaged from one verison of MYOB to another even though the copany name stays the same.  So in order to presrve the trading history through the opmetrix tool, we need to see if we can do a lookup between our MYOB datafile and the new datafile  and do a lookup to match the UID from one file to another.

Anyone know how to export the UID from a file? 

Cheers,

Scott