True 64-bit?

Hi. When I install Avast in Windows XP 64-bit is it running as a 64-bit app or is it just compatible with Win 64? The reason I ask this is because it installs in Program Files (x86) which is for 32-bit apps I think. This question was probably answered but I am horrible at finding things.

Right, avast! is a 32bit program, but it is aware of the 64bit environment.

Please see my last post here: http://forum.avast.com/index.php?topic=9925.0