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This mod uses and comes with the RMusicPlayer tool, a small mod which allows level designers to use flac, mp2, mp3, ogg, wav and wma tracks as music for their maps.
However, this tool depends on custom native code, and, as of yet, has no built-in support for sending its required libraries (dll's) from a server to connecting clients who don't have it installed.
This would mean that players who don't have this particular tool installed, can't connect to EXU servers, or join a server on any other map that makes use of this tool.
Since the audio filetypes mentioned above can't be redirected anyway, I chose to write a fake clone of the RMusicPlayer file, which is still compatible with the original, but also allows players who don't have the mod installed to succesfully join a server on maps that use this tool.
In other words, to connect successfully either you have the RMusicPlayer tool installed correctly (eg. through the EXU mod) or not at all, in which case you will receive the fake clone from the redirect. If you only have the RMusicPlayer.dll file installed but not the RMusicPlayer.u file, you will fail to connect.