Re calibre do-dah:
Download and install the latest calibre. Then create a shortcut to ebook-edit.exe (if you are using Windows.) It will be in calibre2 in Program Files or Program Files (x86).
Then you use File/open and see if it opens there. You can make a trivial change and save it. It will be different from Sigil, since at a minimum it will remove the DOCTYPE. Save it and see what happens.
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