[mso] Outlook Email coming with text as attachment

We have outlook 2002 SP3 and are using Windows XP Pro SP2.  When I send an
email to my boss, he gets the email with the text but also gets the text as
a notepad attachment.  The information is transmitted internally via a unix
file server.

Can anyone please tell me why this happens and how to stop the attachment?

TIA

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.769 / Virus Database: 516 - Release Date: 9/24/2004
 

*************************************************************
You are receiving this mail because you subscribed to mso@xxxxxxxxxxxxx or 
MicrosoftOffice@xxxxxxxxxxxxxxxx

To send mail to the group, simply address it to mso@xxxxxxxxxxxxx

To Unsubscribe from this group, send an email to 
mso-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in 
the subject line.

Or, visit the group's homepage and use the dropdown menu.  This will also allow 
you to change your email settings to digest or vacation (no mail).
http://www.freelists.org/webpage/mso

To be able to use the files section for sharing files with the group, send a 
request to mso-moderators@xxxxxxxxxxxxx and you will be sent an invitation with 
instructions.  Once you are a member of the files group, you can go here to 
upload/download files:
http://www.smartgroups.com/vault/msofiles
*************************************************************

Other related posts: