I stumbled across this by accident, but if like me you’ve noticed that Adobe PDF files don’t show up properly in file previews in 64-bit Windows 7 or Vista, then Leo Davidson has created a handy tool that fixes the problem. It also fixes thumbnail rendering within Explorer in 64-bit Windows too (except for XP64). Although the fix needs re-applying each time Adobe Reader is updated (until they actually fix it themselves!) it’s a digitally signed application, so it should install without any issues. My Windows 7 x64 machine is at work, so I’ll have to try it on Monday and see, but by all accounts the fix is a good ‘un.