If we strip your post to the core, you are saying
My Word documents change the style formatting of my co-worker's documents when I open them.
How would your documents affect any document sent by someone else?
That sounds more like your co-workers have sent a document based on Normal and you have Automatically Update Styles ticked on your PC, therefore it is applying your Normal styles. Could that be the case?
I have never seen anyone find that RoboHelp.wll causes any problems with documents not related to RoboHelp.
Even if my suggestion is wrong, my thinking is this is an entirely Word related issue.
I can try to find out what it does but that might take a few days. I would explore other avenues first.
See www.grainge.org for RoboHelp and Authoring tips
Thank you for your reply.
We are updating everyone to Word 2007. We have narrowed it down to my environment.
I still wonder if RoboHook.wll is necessary for RoboHelp8 HTML. Any ideas?
I'll check back on Monday!
We upgraded everyone to Office 2007 and the issue has been resolved. RoboHook is still around, but since the issue is resolved, this case is closed!