[Willy]

I'm not sure what your have wrong? Here's my folder names for the Corsair Mk.II & IV;


CorsairMkII(GB)
CorsairMkII(Multi1)
CorsairMkIV(GB)
CorsairMkIV(Multi1)

Tried and tested with Desert & Summer folders. As they work for me, they should work for you. I'd suggest going through it systematically to find the mistake, good luck