That's great. The DOCTYPE was changed to reflect this was an epub2 epub and not an epub3. It would have stayed the same if Sigil was set to create epub3s.
Glad to hear it is now working.
A good fix will appear in the next release of Sigil. In the meanwhile, if you run into other problems with adding html files, just check them to see if a doctype is present and if not add one. Sigil is smart enough to correct them based on epub version.
KevinH
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