are they mono
The reason they don't work is because you have spaces in the filenames. Remove those and replace them with underscores, and they should work. Everything else looks fine.
The spaces are replaced with underscores.
Not all of them. Go back and check, you missed an underscore before the "64" in each of the filenames. That's what's making your loops not work.
Aaah, I see now! Thank you.