How can I resync HTML files that were edited in another editor with an WDP7 project?

[steve.ledger]

Paul, I want the index.htm I changed imported back into the WDP7 project.

Web Designer isn't a HTML editor, so you won't be able to bring the index.html back in with your external code changes.

Why? Because there is a huge difference (HTML wise) between what I currently see in WDP7 and what is published on the Web.

Well, as there is no HTML internally with Web Designer during design mode, there cannot be any HTML comparison.
All HTML is generated on export/publish. Aside from HTML snippets you add via placeholders, none exists in the Web Designer design document.