I made a backup of all my CDs when my brother moved out for school and took the lot of them. So I just went to my backup hard drive with all my ISOs on them. Is this why the game isn't working?

I tried exactly that. When I went into "Add Game", it doesn't let me select any of the files. I just downloaded ScummVM today, and am using an iso version of DOTT on my mac. Again, it is a windows version. I unpacked the ISO and i get all sorts of files like INDYDEMO folder and REBEL like ...

I have a copy of Day of the Tentacle for the PC. But I only use a Mac now, so can I use the Windows version to run DOTT on my Mac (running OS X 10.4)?

Thanks for the help!

Btw, I tried using the executable, but it wouldn't let me select it.