Why is worksheet being saved as scrap? why does it have the .shs?

two people are working out of this workbook, but saving changes and
forwarding via email. This time the saved workbook is being renamed scrap and
the email attachment reads with an .shs extension. The second person cannot
open the document.

A 10 second google search found this:
http://support.microsoft.com/?kbid=138275


"saved workbook trouble" <saved workbook trouble@discussions.microsoft.com>
wrote in message news:7ECE3FC1-672C-4B55-8D7E-BB5EF099A222@microsoft.com...
: two people are working out of this workbook, but saving changes and
: forwarding via email. This time the saved workbook is being renamed scrap
and
: the email attachment reads with an .shs extension. The second person
cannot
: open the document.