I’m running Win7 in Parallels on a MacBook Pro. HTML help files (.chm) will not open, I get the “Navigation to the webpage was canceled” message. The files are not tagged as blocked in properties.
I’ve seen (but not tried) some registry entries that purport to solve the issue on a file-by-file or folder basis. I’m hoping for a more global solution.
Windows may be regarding the location of the .chm files as being on a network drive. There’s a link to a program called HHReg on this page: http://social.msdn.microsoft.com/Forums/en-US/devdocs/thread/ef2b95e0-4198-4e1a-b876-314a23348b5e