Uploaded October 2023 | Updated September 2026, 1 week ago

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How To Fix Modern Warfare 3 Won't Start on Steam/Battle Net

In this video, I will be showing you the fastest way to fix Modern Warfare 3 not launching on your Windows 10/11 PC or laptop. Call of Duty Modern Warfare 3 can fail to launch for many reasons, and a common error occurring in MW3 is the game failing to start and you may get an error saying "Failed to open config file (2)" and you will also be missing files and the config file.

Easy Gamer Utility: computersluggish.com/downloads/easy-gamer-utility

Luckily this is very simple to fix on your Windows PC and I show you the easiest and fastest way in this video so that you can get back into the action!

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