Macro-enabled files in Word 2007 & later require saving in the docm & dotm formats, not docx & docm. So you'd need to change both the extension and the FileFormat to match, using wdFormatXMLDocumentMacroEnabled for documents and wdFormatXMLTemplateMacroEnabled for templates. Ordinary templates, btw, should be saved using wdFormatXMLTemplate.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]