What happens when you try to convert the HTML directly through calibre? (Mess and all?)
Can you open the HTML file in OpenOffice?
Have you tried uploading it to Google Docs?
Be warned that I found that Kompozer does not generate clean HTML -- in fact, I gave up completely on WYSIWYG HTML editors after looking at some of the nonsense code Kompozer was putting in my document. Now I edit HTML in a text editor.
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