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Microsoft Application Compatibility Toolkit: ProcessorCountLie shim parameter?

Super User Asked by hexaae on February 5, 2021

Who knows how the parameter for the shim ProcessorCountLie works in Microsoft Application Compatibility Toolkit (Compatibility Administrator)?

I’d like to make some old games incompatibile with 8+ cores work again on Windows 10. I tried MS ACT and set ProcessorCountLie, and set as parameter 2,3,4 for testing but got strange results based on real core usage monitor. I thought it could be a hexadecimal value (tried bot 0x02 and 2…) representing a binary number (e.g. 0x3=3=0011) but still won’t explain the strange results of real cores usage.

Someone knows exactly how the parameter for ProcessorCountLie undocumented shim works, and how can I limit for example to the first 4 cores usage?

Here are my attempts on i7-8750h (6 cores, 12 threads) using as parameter "2", then "3", and "4":

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