I googled "Open Office C#" and found a commonly reoccurring tutorial: http://www.opendocument4all.com/download/OpenOffice.net.pdf
The trouble is this portion (snippet from pdf):
Change from the Visual Studio window to a Explorer window. Move to the CLI assemblies folder. You will find them in your OpenOffice program installation path in the folder named “assembly”. In this folder you should see the following .net assemblies.
I do not have this "assembly" folder. I navigated to: C:\Program Files (x86)\OpenOffice.org 3
It simply is not there. I have to create reports using C#.
As per comments above from the OP the goal is to create DOC or DOCX:
For creating DOCX there is a FREE option (OpenXML from MS) available...
For creating the older DOC format (among lots of other things there is for example Aspose.Words (commercial - just a happy customer, not affilliated).
EDIT - as per comment:
All above options work independently of Word (i.e. don't need Office present/installed on the machine).