Hi,

I assume, there must be some TEMP variable defined in OS environment (i.e: SET TEMP=C:\MyTempDir). I assume (again), Exiftool reads this varible, to know where to store it's par files.
Because I don't know PartPE, I don't know how to do that -but from old DOS times, this variable was written inside autoexec.bat file (which was loaded when OS booted).

Bogdan