[Mailman-Users] problems with attachments/MIME in digests and archives

[debianlists]

I'm running mailman-2.1.2 on Debian woody with postfix 2.0.14.

everything is working fine, except when a user posts a message containing an 
attached word document, the file-extension is changed to .bin or .exe.

 e.g.:

---*snip*---
Dateiname   : Angebot.doc
Dateityp    : application/msword
Dateigröße  : 179712 bytes
Beschreibung: nicht verfügbar
URL         : https://xyz.at/pipermail/autofahren/attachments/20031113/
e261f13f/Angebot-0002.bin
---*snip*---

any ideas?

Thanks in advance

robert