Office SP3 and File formats — In Office 2007, we changed the default to disable a number of older file formats where we saw very low usage and a high security risk in our code that loads these formats. From the security standpoint, this is the right thing to do.
Source: David LeBlanc’s Web Log
Author: David Leblanc
Link: http://blogs.msdn.com/david_leblanc/archive/2008/01…