Forza 3 layers group mod

I apologize if my topic is old and I did a long search here for any close enough thread, but no luck.
I’m having problems with Forza 3. I’m unable to access My Vinyls as the game freezes each time I try, and clearing the cache does nothing. I was hoping to use Horizon to perhaps delete some of those Layers so that the Layers Group Save File will then be smaller. It’s only 11.2 Mb, but it just won’t open in the game.
If someone will please guide me as to what to do to acheive the above mentioned, I’ll appreciate it.
Thank you in advance for your help. TC.

How can I open the LivGroups folder, so I may delete some files and then close it?