That's what I thought I did all this time BUT. Apparently when ScummVM opens the "add game" window you have to click the "open" button instead of just double clicking the folder.

I can't believe it was that simple....

But thanks for the answer dude

Edit: Spelling errors

Alright I've been having quite the trouble trying to figure out how to run MI3 on my mac. Finaly I ended up in this thread. I have a Mac too and have copied the files from the CDs to a folder on my desktop. The comi files are in the main directory and the rest is in the subdirectory named "ress...