set regfile [file join $workdir file]
		set extfile [file join $workdir $extfiletail]
		catch {
			file mkdir $workdir
		}

		if {$multifile} {
			catch {
			if {[catch {
				cd $pkgdir

				file delete $extfile
				exec zip -r $extfile .
				exec zip -r $extfile . -x build.log
			} err]} {
				puts "Error while zipping: $err"
			}
		} else {
			set origfile [lindex [glob $pkgdir *] 0]

			file copy -force -- $origfile $extfile
		}