Thanks for your response,
I have not Thinprint installed on the host.
Is there other application that could prevent detection ? (The OS host is Win10 v1809)
I set LPT3 int the manager, but no change
Need i enable LPT port in the bios of the Guest ?
because, if i have no LPT3 configured in the manager, LPT1 will always appears if enabled in the bios guest...