When playing TS/RA2 on WOL/XWIS, it says I have an invalid serial number. Why?
This is probably because when you first installed TS/ra2, you typed the wrong serial number, (There are several serial numbers the game accepts, but it’s still not the right one. To fix the problem, just reinstall Tiberian Sun or Red Alert 2 with the correct serial number. You will also find that you can use ra2 serial numbers for TS.