I have not been able to play RWR until recently, I had to reinstall it on a different computer and noticed when I tried to change the code within the some of the weapons text files, no changes occurred in game. Specifically the rarer weapons that had to be found on the battlefield such as the XM8 and M107, I tried to add them to the armory in single-player but had no success. Is this because the latest updates?

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Dbzgage, Shut it.

Better read for the matter in Mods section. There are a lot of threads explaining how to do. Also there are a several existing mods including many stuff unlocked, so just take a look at that section.

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"Ad cogitandum et agendum homo natus es"

I work quickly, cheaply and qualitatively. You can choose only two of the three options.