Alright, here are the steps for an online compatible working Rayman Arena which RibShark told me through Skype:
1. Get Evolve (register on their site and download their client), also get Rayman Arena (the PC version's US release which for some reason has a LAN option in it while the "M" version doesn't)
2. Get this file and copy it to:
C:\Users\{your username}\AppData\Local\Echobit\Evolve
Note that this file will manually overwrite Evolve's game database, so it'll recognize Arena when you launch it.
3. Open Evolve, click on "Help", then "Console" and write:
"gamesdb reload" (without quotes of course)
It should give you a message somewhat like this.
"Successfully reloaded games database (4392 games)."
After all this, if you want to play with someone just invite him/her as a friend just like you do it on Steam, BUT in order to play together, you need to create a "Party" first, into which your friend must be invited, then someone will host the game, the other one will connect to it and PIZZAZZ!!! Online Rayman Gaming Achieved!
