Hmmm, I don’t know enough about CUIA to say what’s wrong. I suspect that the A or B has to be in quotes, or you’re not allowed to have the space before it, or some other synatx error. I’ve looked in the wiki and don’t find ZS3_LOAD there.
I did find this clue, I wonder if you’re supposed to put the filename in a string named %s?
Hopefully someone else who knows more will chime in…