Just to check, what is this Developer you mention? I hope you mean modeller?
And if you rename the html file as filename.txt, can you open it then?
Are you trying to use the and
based approach of parsing HTML that was introduced in Monarch v6 or v7? Personally, I've never found that as easy as scraping raw HTML.
You might be able to get somewhere setting the default file extensions for report types in Options >