Microsoft PSF Files are actually not detected as an ensured Type.
For example: http://download.windowsupdate.com/c/msdownload/update/software/secu/2018/04/windows10.0-kb4093119-x6...
I have contacted a colleague internally and update you once I have an update.
I've got the response that we do not currently support .psf files media type detection. If you require this, then please feel free to raise a FMR.
PER/FMR can be done here:
Download the new ePolicy Orchestrator (ePO) Support Center Extension which simplifies ePO management and provides support resources directly in the console. Learn more about ePO Support Center
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