I'm a little confused.  The fix being sent to me was a CSWeapons.dll but in your response and another members you talk about *.xml files.  I know how to navigate to and access FSX files as I have installed numerous Aircraft this way.

I suspect the *.dll file modifies the *.xml file code and after the test, swapping back to the original *.dll file returns the *.xml file back to the default values.  Using the sim for any other reason, like attempting to use weapons with other aircraft causes the program to fail, hence the caution to follow the steps exactly.

I'm sure what seems like a simple fix is anything but given the number of different computer hardware/software configurations.