figured out what was wrong: was using an outdated version of WinRAR, so I've extracted all files now, and it's running beatifully.
HOWEVER, if I want to use the original Curtis Menu screen and have iGO8 launch when I select Navigate, I need to modify the Shell.ini file, right? Where is the file, and will this work if I've taken the easy crack route and downloaded Masalma's crack file?
Yes, you need to change the shell.ini to point to iGO if you want it to launch when you select Navigate. Not sure about how the easy crack works so I can't say for sure, but changing the shell.ini to launch iGO should work.
Masalma?
and for the Mio Shell, which files do I have to copy over to the SD and do I have to rename them?