I just tried to open a 32 bit file in the 64 bit version of Revit Architecture 2009... and Revit reports that the file is corupt, I verified that the file opens in the 32 bit version before and after the attempt to open in the 64 bit version, and it works fine.... so much for compatiblity between 32 and 64 bit versions.
Any ideas on how to fix this FAST... mean while... back to using a slow laptop.