The game was out for awhile in other regions before Altus signed on to publish the Xbox version (all the North American publishers wanted to wait for the sales results from Europe, etc, before making any commitments). Focus published a PC DVD version in Canada a few months earlier than the Xbox release, but the US (and UK) didn't get a disk release.
IIRC the German publisher signed on fairly early, and were the only ones to do a PC DVD release of FoV.