[dokuwiki] IE converting ".doc" to "_doc"

I am having a strange problem that just recently started.  Our Dokuwiki has
been working great for the past six months. It still works perfect in
Firefox, but IE is having problems.  When you click on a link to download a
document, it comes up with an error that say's the document doesn't exist.
Looking at the "save as" window I can see the name of the document as
"something_doc" instead of "something.doc".  Any ideas what would  be
causing this?
Thanks,
Tim

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