labeas, what is it "Paths?" We're trying to enlighten you here to the TC way, but it's a struggle huh?..
I'm referring of course to:
tce-load -i ./oberonV4.tcz
If oberonV4.tcz is placed in the TCE install directory as it's expected there is no requirement for a path in the tce-load command. It matters not where you open a command line, tce-load will expect to find the extension in the correct system tce path.
Try placing oberonV4.tcz in your tce install directory (tce/optional/ ) and run:
tce-load -i oberonV4
Note: No path or file extension is required at least with regard to tce-load command