If Steam detects it’s running in compatibility mode, you’ll see a message like this one: If you right-click the Steam shortcut and select Properties, you won’t see any compatibility settings being applied: Windows has hidden the compatibility mode setting it applied – you can only remove it from the registry.
First, launch the registry editor by clicking Start, typing Regedit into the Start menu, and pressing Enter.
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You can tell Windows to run on the game on only one CPU core to solve this problem – this is referred to as setting the game’s CPU affinity.
The easiest way to do this is by launching a game, alt-tabbing out, opening the task manager, right-clicking the game’s process on the Processes tab and using the Set Affinity option.
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GCFScape is a small tool that can open and extract from GCF files that are utilized by Steam for game content storage. GCFScape 1.7.1 or better is required to open VPK files.
Be sure to close Steam completely (click the Steam menu at the top of the Steam window and select Exit) before deleting this file.
Steam periodically detects the closest download server to you.
After deleting this file, you’ll have to log back into Steam and other local settings will also be lost – for example, you’ll have to re-categorize your games.
You’ll find this file in your Steam directory – C:\Program Files (x86)\Steam by default.
Corrupted files can also cause a multitude of other odd game bugs.
To fix corrupted game files, you can have Steam validate the game’s cache on your system.
Windows doesn’t “save” CPU affinity between sessions – when you close Steam and reopen it, it will use its default CPU affinity settings.