Probably the easiest thing to do is get yourself a macro program and assign the Command-F shortcut to an alternative.
Your program may have done that automatically when you installed it.
Alternately, upgrade to System 7.5 or higher since the Find File DA is superior to System 7.1's command.
Your program may have done that automatically when you installed it.
Alternately, upgrade to System 7.5 or higher since the Find File DA is superior to System 7.1's command.