Hi to everyone! i'm new, but i already have a problem... xD

i have: Mac OSX 10.6 (Snow Leopard)
DOSBox 0.73 (latest version)

i just downloaded Inca II, but it's splitted in 10 .ima files. thing is: i don't know how to mount them...
i open the folder where i put them, but then i can't run the 1.ima file.

HEEEEEEELP!!!!!