I thought it scans both....
I keep my 64bit plugs seperate ... and actually don't bother scanning the 32bit equivalent.
So if I'm using a 32bit plugin on a 32bit computer at school and bring the file home to my 64bit comp it opens automatically the 64bit version.
But ... If on the 64bit computer has scanned the 32bit version as well....
when I open that school file on my 64bit comp at home it opens the 32bit version via bitbridge... hence why I don't bother with scanning 32bit version.
Hope it makes sense - just woke up.....