Hmm, I don't want to hijack the thread but I wonder if this could be the same issues I have encountered.
I have the Steam install (automatically patched to 1.4), running Vista home premium and downloaded the GWX3 GOLD. I found the SH3 install in the steam folder structure and installed the mod there.
Install went totally fine. Then when I tried to run the game, I got the error message from Steam: 'Failed to load game (app already running)'. Tried lots of times with both the new GWX shortcut and the old SH3 one but no joy.
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