From \docs\uharc_license.doc:
I'm assuming this affects two files:The commercial use of UHARC package requires a registration (contact: Uwe.Herklotz@gmx.de). No registration is needed for private or other non-commercial use.
UHARC02.EXE
UHARC04.EXE
So if you're at work, you should delete these files or register.
If nobody minds, I'd like to put up a note on the Universal Extract entry.