I had the same problem importing an RH for Word project into RH11.
Almost every link in the project was corrupted - both links in TOC and within topics. The TOC links were all showing as external links, not regular page links.
The corrupted links all started with a couple of garbage characters, then "n.chm::" followed by the actual link text.
By trial and error, I found that the same options Steven used worked for my project. That is:
- In "Import WinHelp Project: Folders": select "Do not create subfolder" under "Folder for HTML Files"
- In "Import WinHelp Project: Features": select "Retain" under "External Topics"
Once I set those options, all the links were fine.