Download an unmodified zipped archive of LiteCart (same version as you are running). And unzip it on your local drive.
Use a file comparison software such as WinMerge to compare the untouched set of files against your modified set of files.
Files that show conflicts are assumingly files you have modified. Create a vQmod that performs the same changes and restore your modified files to the originals.
You are now good to go and can easily carry modifications between platform updates.