If this helps anyone: I just tried to import into QFG2 with some old exports. My export was named THIEF.SAV, had to rename to theif.sav (no capital letters) before it would let me import.
Thanks very much. I tried a couple of the other suggestions with no luck, but this worked for me. The.SAV was automatically created in all capitals and even though I copied it across to the QFG2 folder, it was not recognised. As soon as I changed the name to all lower case it was recongised and appeared in the import dialogue box.