WHAT ARE REQUIREMENTS?
First, if you want to play RA3 in co-op, you need to have some tools:
c) Hamachi ( if you want to play over the net )
You can download these here:
This tools need .NET Framework 3.5 i Visual C++ 2008 Redistributables to be installed.
Now, when you have the right tools we can begin installation.
Extract RA3Coop.exe into the folder where you have installed RA3.
In the same folder, extract MapExtractor.exe from folder MapExctractor.
Extract Coop.dll from Data folder in .rar to Data folder in your game folder.
Run MapExtractor.exe and click Extract & Rebuild Campaign Maps! button.
When you finish, close MapExtractor and run RA3Coop.exe.
Check under Skudef if your language is selected, and under Executable your game version.
When you have checked, click Launch. ( You can run it in Window mode if you tick Windowed)
When your game loads, select Versus -> Network.
When you enter it, he, who creates game, must click Create Match.
Now, you can notice that there are more maps than usual, and those maps are from Campaign mode.
Select your map ( mission ) to play, select your positions and click Begin.
Rules and nations will be selected automatically, on what effects the mission iteslf, because if you select Soviet mission, you will play as Soviet, so you don't have to ajust these settings.
When the mission loads, you will play mission like inCampaign mode! It will have all objectives, but, you are playing with your friends!
You can see on image that ground is black, but you need to know that this is still software in development.
a) When you play some maps, ground is black.
b) When you try to leave game, there is possibility of crash of the game, so it will exit itself.
There will 1.1 version of this software to be released soon, so i hope it will fix these bugs
That is it!
I hope this helped you!