Give the NAS a local drive letter. Close Desktop. Stop the server. Do the regedit. Launch Desktop. It'll complain about the MTR folder having been changed. Point it to the MTR folder you should have already created on the NAS, which Desktop should see as "driveletter":\My TiVo Recordings For instance, I just tried it and Desktop now thinks the MTR folder is X:\My TiVo Recordings (where X: is actually the share folder on my LinkStation Pro), and downloads shows to there instead of the PC. The only drawback for me is that giving it the drive letter on my main PC makes the LinkStation no longer visible to the other PCs on my network, but it was just an experiment and I don't use my main PC to run Desktop anyway, and the LinkStation is only 500GB, which is about 29.5TB too small.