Using Word 2002 in XP

When I open Word it opens a blank document 1 - which is normal.

When I then click on "File/Open.." and click on one of my saved documents,
the new document opens as a 2nd window leaving "Document 1" open. This is a
new behavior. I am not sure what I changed, but I think I recall the saved
document replacing the unused Document 1 instead of opening a 2nd window.
How do I get back to that earlier behavior?

Thanks.
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Jeff Stevens
Email address deliberately false to avoid spam