Here is some reference material available for the OpenDocuments ActiveX control

Here is the OpenDocuments ActiveX Control documentation available on msdn, which was barely updated for wssv3, see my comments under Community Content. This documentation explains how to connect your OpenDocuments Control to SharePoint.

For wss v2, there was the SharePad Reference Application for SharePoint Products and Technologies which Mike Fitzmaurice [MSFT] talked about it here. It is on GotDotNet which is currently being phased out, so this link may break in the near future.

But for wss v3, this application was not been updated. Not sure why. One would think that Microsoft would want third parties to integrate these files w/ the SharePoint environment, especially moving forward with SharePoint 2007.

--Tom