When a file is opened from the Finder, it is opened by the application that owns it. Therefore, since applications other than Script Debugger (such as Apple’s AppleScript Editor) can claim ownership of script files, you might want to control the ownership of files created by Script Debugger.

To make Script Debugger the owner of script files:

• Go to the General preference pane and check “Default editor for OSA scripts, applets and droplets.”

This is a quick way of setting Script Debugger as the owner for files with the relevant filename extensions (.scpt for a compiled script file, .scptd for a compiled script bundle, .applescript for a script text file); you could do the same thing in a script file’s Get Info dialog in the Finder.