SetWindowsHookEx failing in .NET 4.0 on 32-bit machine with “module not found”?

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Yup, I think you understand what’s going on. SetWindowsHookEx() requires a valid module handle, and verifies it, but it doesn’t actually use it when you set a low-level hook. You just need a valid handle, it doesn’t matter which specific one. Calling LoadLibrary(“user32.dll”) is a good way to get a handle, that DLL will always be loaded anyway since you P/Invoke its methods. And it is always loaded by the CLR bootstrapper (mscoree.dll). Don’t bother calling FreeLibrary(), it makes no difference.

Later versions of Windows no longer perform this check. Not exactly sure when that started, somewhere around Windows 7 SP1 I think. Probably meant to be helpful but invokes the “works on my machine, not the customer’s” failure scenario.

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