Here is a quickly done movie on how to edit CFS3 for Multiplayer running on Windows 7.
Note : This can be done for all expansions, with the exceptons being that ETO requires additional editing to a .bat file, and if done for MAW you will need to work with the file called "Normal.exe" and not the CFS3.exe (ergo it is done exactly the same for the current PTO, Korean Skies, and I presume, OFF).
For expansions I include an appropriate "abbreviation" when renaming the .exe
Examples : CFS3mawWin7.exe, CFS3ptoWin7.exe, CFS3ksWin7.exe
Note : They are not case sensitive and can be named anything to differentiate them.
I have configured all the freeware expansions using this technique and have tested each one.
Hopefully this video is concise and easily understandable for those of you transitioning to the new OS.
For a clearer, full screen viewing of this movie, go to You Tube to watch it, search Phenozo there.
Or just click onto this movie again once it starts playing and it will go to YT automatically, where you can full screen it.
~S~