What email program are they using?


"UK-Graham" wrote in message
...
: I am running Excel 2003 and yesterday I emailed (using Outlook 2003) twice to
: different addresses at the same client with .xls attachments. Both times the
: attachments arrived as .dat files. When I sent myself one of the messages as
: a test, it arrived with the attachment OK and uncorrupted. Any ideas? is it
: their virus protection maybe?