If it’s WebHelp help output, you’ll need to reverse engineer it back into a RH project. If it’s a CHM already, I believe you can load that directly into RH to create a project – if I’m wrong on that, it can be reverse engineered – see Willam’s scripts for sale on his site – www.wvanweelden.eu<http://www.wvanweelden.eu>
Thanks for your reply.
I've looked up at the website, but it looks like the reverse engineering process works with projects that were created with RoboHelp in the first place.
In my case, the projects were not created with RoboHelp, so I wonder if it could really work...
Do you still have access to doxygen? If so, try generating a CHM, PDF or some other format that can be imported directly into a RH project. I doubt whether Willam's site would catch everything if the output was not generated by RH. Then again, maybe Willam coulf tweek it so it did.