Yeah, I realize PC X4 is elusive. But we don't need Capcom kicking the crap out of us. They tend to not stomp out encouraging the fans; they even turn a blind eye to soundtrack downloads if they don't believe it'll cut into Japanese sales. But it's a safe bet distributing the full game would be over the line.
Besides, Google works. It's a pain to find a version that hasn't been stripped down, but it's out there.