As already explained …
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The calibration settings are stored in the hardware calibrated monitor, that is one has to change the color space / ICC profile at the monitor side.
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Setting the Windows Color System to something else does not trigger the hardware calibrated monitor, so that things get out of sync.
… XnView as I have described are reading the ICC of the images by default but can also be configured to lean on the system ICM-profile of the OS. …
In XnViewXP (checked that version and some other applications) the Preview is color managed,
but not the “Thumbnails”. So one has to be careful when comparing …