A suggestion on my local Mac forum is that the Intel Mac's require
AppleScript files to be saved as bundles, else they will be run as
PPC files by Rosetta.
Can anyone confirm or contradict that?
That's true if and only if you're referring to scripts saved as
applications. The script itself does not contain any PPC or x86 code
-- it's data that's fed to the AppleScript interpreter. What matters
is the flavor of the executable running the script.