[Dovecot] Backing Up To Windows File Server

[Asai]

Greetings,

Working with dsync and setting up backups to a Windows file server.  
Problem seems to be that Windows is renaming the dovecot mail files 
(maildir) to Windows friendly filenames, and losing the Dovecot name. 
For example,
1323817925.M36368P32049.triata.globalchangemultimedia.net,S=2255,W=2318:2,S 
becomes 1AETPH~X.

Does anyone have any ideas about how to tell Windows to not do this?  Or 
is it not possible?

-- 
--asai