I hadn’t seen this documented anywhere else, and just stumbled across it… I wanted to update several AppleScript applets that were PowerPC applications into Univeral binaries.
Note I’m talking about the sort of AppleScript applications that one builds with Script Editor and saving the script as an application – not AppleScript Studio apps.
When you save an AppleScript in Script Editor, there are several options in the File Format menu. If you choose “application”, you’ll get a PowerPC-only app. However, if you choose “application bundle”, you’ll get a Universal app.
So open your AppleScript apps in Script Editor, and resave them as “application bundles” and you are set!