very very interesting.
practically on my release (trymedia) the files have the information table (where are located all the filenames and their offsets/size) encrypted while in yours they are non-encrypted.
I have updated the script for "guessing" automatically if a file is encrypted or not.
the link is ever the same (remember to refresh with F5 to avoid to reload your cache):
http://aluigi.org/papers/bms/tough_trucks.bms