This list of File Properties can be controlled by modifying the InfoTip.config file located in:
C:\ProgramData\Autodesk\Inventor 2011 for Windows Vista and Windows 7, in XP it is located in Document Settings
This file contains all of the available iProperties, i.e. Property id="5" name="Part Number" exclude="no"/
Simply change the exclude="yes" to exclude="no" to make that particular property appear in Windows Explorer.