The problem with installing any modification, no matter how small, is that you have to sacrifice Multiplayer gaming. This is because the files you have on your machine will be different from other people who play online. Only vanilla versions of RTW are compatible with online multiplayer servers.
That said, if you find someone else who has exactly the same version of a mod installed, you should be able to play online against them.
I decided to make this choice a while ago, as multiplayer gaming became a bit too repetitive IMO. You can always keep a backup copy of vanilla and use this to play online whenever you like, its always best to keep a vanilla version so you have something to fall back upon when the need arises.
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