Using the "Loader", add the it to the IRIS F-16D Viper CL.

For the rest of the IRIS F-16 Vipers (see the list below), open the Panel folder in each, backup the panel.cfg, and then replace what is written in the panel.cfg

This:
[fltsim]
alias=\IRIS F-16D Viper CL\Panel

with this:
[fltsim]
alias=\IRIS F-16D Viper CL\Panel.csweapon

You will also need to copy the csweapon.xml from the IRIS F-16D Viper CL, into each model folders. Listed here:

IRIS F-16D Viper AG
IRIS F-16D Viper AGRS
IRIS F-16D Viper CAP
IRIS F-16D Viper CAS
IRIS F-16D Viper CFTAG
IRIS F-16D Viper CFTCAP
IRIS F-16D Viper CFTCAS
IRIS F-16D Viper CFTCL
IRIS F-16D Viper CFTF
IRIS F-16D Viper CFTTR
IRIS F-16D Viper CH
IRIS F-16D Viper F
IRIS F-16D Viper TR

This will then give you the ability to use Weapon for FSX in ALL the IRIS F-16 Vipers.

Mark