Are both wdFormatDocument and wdFormatDocument97 really 0? I don't want to use the enumerator name as I only have Office 2003 installed on my developement computer.

Concerning: wdFormatDocumentDefault .... Word default document file format. For Microsoft Office Word 2007, this is the DOCX format.

This actually depends on the Save settings . A default file format can be entered there. This is the file format that will be used to save the file.

Why would MS put 2 different constants with the same value ?

This in fact confuses people more than help. Besides I find that when I use MS office to output documents from my applications, I have keep jumping back and forth.

This become impossible when I do not have any control over the type of MS office installed at the user end and do not have the ability to change the settings.