Ed wrote:
Under Windows XP and Word XP, one user opens a text file and gets a
dialog box asking which text converter she wants to use, default
being Unicode 7. Two other users with the same system, same image,
same programs open the same file, and Word opens them directly with
no dialog box and no difficulties. Where do we look for the setting
that controls this?

Ed

Probably Tools Options General "Confirm conversions at Open".

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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org