In Windows, if you want to create documents with the right click menu in your file browser (Explorer), then you have to follow the following steps. The New document feature is indeed an Operating System feature that can't reflect the changes made in the OpenOffice configuration after installation.
- Create a new document from within AOO (will be based on your default template)
- save it as soffice.odt, overwriting the file (if already existing) in the folder (you may have to do that as administrator):
- C:\Documents and Settings\All Users\Templates for Windows before Vista
- C:\Users\All Users\Templates or C:\ProgramData\Microsoft\Windows\Templates in Windows Vista and versions above.