FM 10 help hosed

[Robert Lauriston]

I checked the FM 10 help option called something like "Display in
browser" (as opposed to "Community help" which I presume is AIR Help).
Now when I try to access the help I get this error message in my
browser:

"No webpage was found for the web address:
file:///C:/Users/rlauriston/AppData/Roaming/chc.4875E02D9FB21EE389F73B8D1702B320485DF8CE.1/Local%20Store/Help/en_US/FrameMaker/10.0/Using/WSc1f2aa87c26d57661e63e3d11d3ff5863d-8000.html"

That page does not exist. The only file in that directory is
helpmap.txt (which does have an entry for that page).

I deleted maker.ini but that didn't reset help to the default.