This is a simple update to the Windows servicing stack, most likely in preperation of SP1. It updates the servicing stack from 6.1.7600 to 6.1.7601, you can get this information yourself by just looking at the contents of the update package.
With directories named amd64_microsoft-windows-servicingstack_31bf3856ad364e35_6.1.7601.17105_none_67912f55dde10d6f and x86_microsoft-windows-servicingstack_31bf3856ad364e35_6.1.7601.17105_none_0b7293d225839c39 and looking inside finding things like pkgmgr
etc it is easy to work out what this update is for. As others have said, this update is exactly like what came with the Vista SP1 and SP2, and it is also most likely installed along with the current RC of the service pack too. All it does is updates the Windows
servicing stack ready for the service pack.
Any samples given are not meant to have error checking or show best practices. They are meant to just illustrate a point. I may also give inefficient code or introduce some problems to discourage copy/paste coding. This is because the major point of my posts
is to aid in the learning process.
Visit my (not very good) blog at
http://c2kblog.blogspot.com/