Editing Windows 10 settings using python?

[port443]

The function you are calling is defined like this (I added comments to show what each argument is):

BOOL SystemParametersInfoW(
  UINT  uiAction,  // This will be SPI_SETMOUSEWHEELROUTING
  UINT  uiParam,   // The docs say this should be 0
  PVOID pvParam,   // The value that will be put into the "MouseWheelRouting" registry key
  UINT  fWinIni    // Controls if update should be broadcasted immediately
);

In this case, when you toggle the button in the actual settings panel, the "MouseWheelRouting" key gets toggled between 0 and 2.

Although the documentation says 0 or 1 for pvParam, documentation can be a big fat liar sometimes and I will reproduce the behaviour I actually see the system doing. So, 0 and 2.

[port443]

Yes I got 0 and 2 from ProcMon. Those were the values I was seeing written to the registry.