Captain Sim wrote on Feb 9^th, 2011 at 3:14pm:

The Weapon is a simple one click installation for default aircraft (listed in the Manual). But installation to a random third-party aircraft obviously requires some extra efforts from a user.

On the Weapon for FSX product page you mentioned in bold red text:
"The Weapon is not just a modification for some specific aircraft.
The Weapon works with any FSX aircraft/rotorcraft."

This would cause a customer, such as myself who purchased today, to assume it does just that.  However upon discovering this thread it seems to fall short of that.  I didn't think I'd have to be poking  around in files, experimenting, editing etc. for it to work with other third party aircraft.  Personally I don't have the time or know how to do all that.