|Change the HTML File's Extension|
The default configuration is shown here:
;--- Default DOCO extension (HTML Application - gets around WINXP SP2 issue) --- #define? MAKEMSI_HTML_EXTENSION hta
Browser such as firefox do not know what to do with html applications (.hta), for maximum support you should use ".htm" or ".html", however this may mean that there are restrictions or stops on some of the more advanced features of the documentation such as the file verification button.