Fundamental question on how to get the bits to work together: I\'ve not used VSTO before and after 4 hrs of searching I\'ve decided to ask!
I want to create a simple Add
Here is the VSTO specific event handler for "BeforeSave" (with example): MSDN
If you want to completely override the File > Save behavior of word, please reference these Stackoverflow questions:
Office integration (Word) - intercepting save Handle File->New in Word 2007