Problem with MAPI sending attachment through Outlook

[Spajder]

Hi,

for sending emails with attachment in Windows 7 through Outlook 2007 with MAPI control, I'm using this code:

If MAPISession1.SessionID <> 0 Then
   MAPISession1.SignOff
End If
MAPISession1.SignOn
MAPIMessages1.SessionID = MAPISession1.SessionID
MAPIMessages1.Compose

MAPIMessages1.RecipAddress = "smtp: [email protected]"
MAPIMessages1.RecipDisplayName = "smtp: [email protected]"
MAPIMessages1.AddressResolveUI = True

MAPIMessages1.MsgSubject = "My email with attachment"
MAPIMessages1.AttachmentPathName = Path & "\" & name
MAPIMessages1.MsgNoteText = "Hi there. " & Chr(10) _
     & "Here are some pgp files for you!"
MAPIMessages1.send False 
If MAPISession1.SessionID <> 0 Then
   MAPISession1.SignOff
Else
   MsgBox "This email could not be send to recipient!"
End If

In this resolved thread http://www.vbforums.com/showthread.php?t=605286 you can read, what was the problem with sending email in Windows 7.
With the code above I can send email with attachment without any error. But some recipients are reporting back to me, that email attachments (like file.pgp) are in wrong format or the files are not attached at all. Some of them have had attached only this file: Winmail.Dat.
I suspect Outlook for this weird behavior. Is something missing in my code or what in my code makes attachment in email corrupt?

Thanks in advance for any help

[Spajder]

I just got the news, that recipients, who have problems with email attachment, are using either Outlook Express or Lotusnotes email client.

But I'm still puzzled, how to solve this...