First ISO/GCM Ever - Help Please!

[HDitzhazy]

Okay, So I downloaded the Sims Bustin' Out for GC and unpacked the RAR files, extracted them into .GCM files, anded ended up with like, 11 different files. I try to open them on my Dolphin Emulator but it doesn't let me. Anyone have a quick fix for this? Does it involve somehow combining all the files together?

Here is a picture of what I mean:

[Sonic riders zero]

Unrar only the first part of the winrar files I mean Part 1 and it automatically extract the others after that you'll get only one gcm file and it will work don't forget to delete that gcm files that didn't work and tell me if this worked with you