I came across this the other day and remembered that someone was looking for this info.
Seems like it should be valualbe to others too.
c/p

This file will allow you to contol the nfusion with your TiVo

Here is the file everyone seems to be looking for.
Your TiVo must be hacked to allow shell access.

1. Copy to /var/hack using smartFTP Client
2. Telnet into your TiVo using PuTTY
3. $ cd /var/hack
4. $ tivosh
5. % source nfusion_into_primestar.tcl
6. % loadcodes
7. Hit control-c to reboot your TiVo and replace existing Primestar IR codes with nfusion codes
8. Now when you select Primestar as your receiver type, you will get nfusion codes

This file was created to control the Nova but will also work for the Solaris ,Phoenix,and the Nuvenio HD box since they use the same remote codes.