TNEF decoder error

[Martin]

Hi,

I've noticed the following in my maillog today:

May  2 15:33:00 mymachine postfix/smtpd[25300]: connect from 
[xxx.xxx.xxx.xxx]
May  2 15:33:00 mymachine postfix/smtpd[25300]: 1B82C43E00: 
client=[xxx.xxx.xxx.xxx]
May  2 15:33:00 mymachine postfix/cleanup[25301]: 1B82C43E00: hold: 
header Received: from [xxx.xxx.xxx.xxx])??by mymachine.id.local 
(Postfix) with ESMTP id 1B82C43E00??for <user at mydomain.com>;  from 
[xxx.xxx.xxx.xxx]; from=<sender at domain.com> to=<user at domain.com> 
proto=ESMTP helo=<blabla>
May  2 15:33:00 mymachine postfix/cleanup[25301]: 1B82C43E00: hold: 
header Received: from user (xxx.xxx.xxx.xxx) by blabla (7.2.070)? 
  id 444497C50036BC75 for user at domain.com; Tue, 2 May 2006 15:32:53 
+0200 from [xxx.xxx.xxx.xxx]; from=<sender at domain.com> 
to=<user at domain.com> proto=ESMTP helo=<blablabla>
May  2 15:33:00 mymachine postfix/cleanup[25301]: 1B82C43E00: 
message-id=<DOEMJBDFALJBGBHJENOIGELJCHAA.sender at domain.com>
May  2 15:33:05 mymachine MailScanner[19118]: New Batch: Scanning 1 
messages, 4733 bytes
May  2 15:33:07 mymachine MailScanner[19118]: Expanding TNEF archive at 
/var/spool/MailScanner/incoming/19118/1B82C43E00.9B11B/winmail.dat
May  2 15:33:07 mymachine MailScanner[25304]: TNEF decoder failed with 
real error: Can't run tnef decoder: No such file or directory at 
/usr/share/MailScanner/MailScanner/TNEF.pm line 237.

What is wrong with this file, and how can i prevent this error? I've 
searched the logs and it seems like it only happens when there's a 
attcahment named winmail.dat.

I'm using MailScanner 4.51.5.

Thank you