We need to import a lot of old HTML files (originally produced in XML) into a new project. Our new files have the doctype:
<!doctype HTML public "-//W3C//DTD HTML 4.0 Frameset//EN">
This is fine for them but to fix various issues with formatting the old files we want to replace the above with this:
<!doctype HTML public "-//www.w3.org/TR/html4/loose.dtd">
Making this change and saving a topic fixes all the formatting issues but the doctype quickly reverts to the original one, certainly after saving and reopening the project. Is there a way to turn off use of the Frameset//EN doctype? It does not seem to be essential to use it.