I didn't notice when this was fixed, but all of sudden iTunes and Safari are four-corner resizable on Windows. My QuickTime 7.4.5 was still "broken". Are they four-corner resizable on Mac OS X now?
If you are looking for a lightweight way to watch QuickTime files I recommend
QuickTime Alternative.
Bonus:
If you can't stand the bloatware of Windows Media Player, a good alternative is VLC Media Player. Find it
here.