I suggest PyTivo. It is totally free.
Desktop free only will work with selected files with extensions, .tivo, .mpg, and only a few more, where Plus has more.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!