My Delphi 7 installation started giving this error. The error message shows the correct help path, but with the backslashes removed. The Help files are present in the expected location (C:\Program Files\Borland\Delphi7\Help). I'm running D7 under Windows 7. It was working previously.
Sometimes I also get this error :
I have searched on Google, and I find others reported the problem, but no solution has been posted.
I have found that this error can be cause by help files missing from OpenHelp project.
To replicate error I would just add {$WARN} to simple project and press F1 on WARN word.
To fix it: