You probably read the MSDN Magazine article: Setting Word Document Properties the Office 2007 Way by Ken Getz. This was one of the first articles related to the Office Open XML Formats published by MSDN and it really helped me understand the Word document manipulation possibilites offered by the Office Open XML Formats.
Today we published a new Office Visual How-to by Ken Getz: Office Open XML Formats: Setting Custom Word 2007 Document Properties.
This article provides code in VB.NET and C# and a cool video that will help you understand how to set and retrieve custom document properties using the System.IO.Packaging library, XML, and the Word Open XML Format.
I will learn about the properties for a word document
My Project requires inserting and retriving of custom properties to an word document