Doesn't Cake supply a tool called 'Cakewalk Audio Finder' for this very purpose?
Alternately: Start Menu>Search>"Your Song Title".
OR,
Open X1, go to EDIT>Preferences or just press 'P'.
Look for where your default Locations for file saving is and then go look for that file manually.
Files have been forward compatible form one version up to the next for quite a while now.