[H] stumped

[Christopher Klein]

I have a client who is looking to change this.  If you
receive a word document as an attachment in Outlook,
and double click on it, it opens it word automatically
in the book view(pages are side by side).  However, if
you save the document to the hard drive first then
open it...it opens normally.  It's not set to this
format at all before being saved.  Any ideas, options
to set, etc. to keep this from happening?  It has
happened on every machine I've tested it on so far.