I can't answer that, but I'd like to piggyback another DVR question on your thread: Is there a way to permanently save a program recorded by DVR (e.g., burn it to DVD)?
TiVos have analog ports out to allow you to save to either VHS or DVD. It won't make as nice of a copy but it can be done very easily.
Or, with a little more fiddling on the PC end of things, there is an open-source software project that will rip content via ethernet to your PC and then convert it to .avi. You could then watch the ripped content from a media server or burn it to disc to watch on a PC.
The big problem is defeating TiVo's DRM, some shows have it and some don't.