First check Tools | Options | HTML Editors and see what is
set as the default.
You can right click a topic and choose what it is edited
with.
As to the overall process, there is a topic on my site about
reverse engineering a CHM.
If no links were working, I would check that you were using
RH6. If some are and some are not, check the paths and ensure they
are still vaild.
Help others by clicking Correct Answer if the question is answered. Found the answer elsewhere? Share it here. "Upvote" is for useful posts.