If I open an Excel file (.xls) that is attached to a Outlook calendar invitation, it saves the changes as a .xls file.
It saves it in a folder under blah..blah..user_name...Local Settings...Temporary Internet Files named OLKxx. (Open an attachment and choose Save As. It should be set to to save it in the OLKxx folder.)
It also changes the attachment, so that if I open the attachment from the invitation, all of the saved changes are there.
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