Whenever I launch GTA-IV (via Steam), I'm prompted to "log in to Social Club". I'm not interested in multiplayer or video uploading features, at least at the moment; how can I stop this window from appearing every time I try to launch the game?
This is obvious 4+ years old now but here's the answer, which I found after fiddling around intercepting windows messages.
<steam path>\steamapps\common\Grand Theft Auto IV\GTAIV\paul.dll
<steam path>\steamapps\common\Grand Theft Auto IV\GTAIV\paul.disable.dll
Annoying Rockstar Social Club dialog will now be suppressed.
Also, if you have more VRAM than 2GB then GTA 4 thinks you don't meet minimum requirements and locks the game to 800x600 with the lowest available graphics settings. To fix this click the
SET LAUNCH OPTIONS button in the game's steam properties sheet and add