Unless you document has previously been saved as an email mailmerge main document, I can't see why it would re-open as one. Such documents, too, I'd expect to open with the usual mailmerge SQL prompt. Answering no to that, then saving the document, will convert it back to an ordinary Word document (albeit, with any mergefields intact).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]