Well, I think I may have found a solution.
Instead of using Xport360, use this:
https://digiex.net/threads/velocity-...ananger.14615/
Run it as admin, go to Tools>Device Tools>Raw Device Viewer
then right click and select copy file(s) here and select the roster file
It works even with UAC enabled. I will open it in game to verify.
Edit: Confirmed solution!