Outlook attachments

Help,

When sending a mail + attachment via MS Outlook 2002, the receiver can't see the attachment (with Outlook Express 6). The size of the mail is correct, when I look at the detailed description I see large binary data at the end. So, the attachment is there but I can't open it.
The security setting is disabled in the Options menu.
I have posted an example of such a mail. (don't be afraid, there's no virus! I simply renamed the extension to .txt, otherwise I couldn't upload it, just remove the .txt extension and doubleclick to open it in Outlook).
Please some reactions.