Lots of updates.  Of note:

Inclusion of a plug-in manager

Necessitated the inclusion of Zip functionality (thanks to the SharpDevelop project [http://www.icsharpcode.net/OpenSource/SD/])
AppDomain manager (for loading and unloading code)

Fixed Preview file error: Follow the code execution patches, windows has changed the format in which file names are passed to applications.  This corrects the problems introduced by this change.
Fixed […]