right, now i noticed that nobody mentioned here about this so i'll start +)
Red Alert 3 Lan Coop v1.1
my first copy-paste thread here so any coments?
probably i should have posted it in tools :S
Played with my friend, only drawback is that your game crashes after you win or loose match, but thats not a big deal, afterall you CAN play coop now if you have not bought this game =)
will be waiting for next version wich will support ai difficulty change(default: normal) and in game cinematics and crash fix also
oh and also please ensure you have installed .NET Framework 3.5 and Visual C++ 2008
and a pretty picture here

As we all know, Electronic Arts decided not to include Coop-Campaign functionality in LAN network menu of the game. We decided to change that - in result, you can now play any mission of your choice, with your friend, on LAN (or over Hamachi), without need of being connect to the internet (EA Servers). You bought the game so by all means, you deserve it!
Please note that black textures occur (most likely) only with 1.0 version of the game - please update to 1.04!
Here is what you need to do:
- Turn off the game!
- Extract “Ra3LanCoop_v1.1_TeknoGods.rar” to the Red Alert 3 installation folder.
- Extract & Rebuild Campaign maps into LAN-friendly format using our home-brew map extractor utility which should be now located in “<RedAlert3Installdir>\MapExtractor\MapExtractor.e xe”. Screenshot:

- Run the game using “RA3Coop.exe”. This program enables you to choose a game version to execute, different language, configuration file, switch the window mode ON/OFF, disable bad language filter and switch coop mode ON/OFF, in case you would like to simply run the game normally. In the future we will also enable the AI difficulty settings, right now they are causing very heavy network desynchronization and disconnects. Screenshot:

- In game, do not use LAN menu to play Coop-Campaign games with AI, use Skirmish menu instead.
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Additional screenshots: Skirmish Menu, LAN Menu
The release can be found here: Ra3LanCoop_v1.1_TeknoGods.rar
You might also need: .NET Framework 3.5 and Visual C++ 2008 Redistributables.
Code:
NOTE: Do not download this program from any other site! To ensure your download is not infected with some malware, here are the checksums:MD5 Sums (version 1.1):
a94e95a8bdd564c0a0f4df4a7393eec3 *RA3Coop.exe
e4838742ec7e9c931668766ba674329c *coop.dll
e9917ab438216c95f2a19c97e0229818 *MapExtractor.exe
If the game crashes to you, could you kindly send crash report to: adm...@teknogods.com. Thank you!