1) Yes, same drive under same letter R:\, external drive.
2) No, I import the roms from the C:\ telling Launchbox to automatically move those roms in the correct folder.
3) Drap/Drop mostly, but even wizard didn't work.
4) All folders are named the same way as the platforms, Launchbox created them itself in the first place, and yes, all folders actually exist.
5) So many platforms (Commodore 64, Game Boy, PS1, etc etc), but anyway, none of them work(ed). Scraps are "by default" for all platforms.
PS: I just wrote a post below to explain how I (maybe) solved my problem....
Thx