IOW, you mean you can have two save channels going, one in SP and one in Raid mode, independant of each other?
Do you and your friend both use trainers playing Raid? What's the main difference between Raid and standard co-op play other than stages versus chapters?
They are a single file. I do heard that trainer able to corrupt the save during Raid Mode. It happened to my friend once. and That is the reason why I have Save Game Manager to back up all my game saves just in case if something like this happen. and so far I haven't experience that issue.
We do use it during Raid mode, but only prefer using it if we are playing together.
Raid Mode is basically a co-op game. Raid Mode came with ARPG element, you get to level up your character and modify weapons.
If you want to know what it look like, look up youtube for raid mode game play.
[Edited by aquafusiondane, 9/6/2014 3:22:56 PM]