[Dovecot] Dovecot 2.0 - expire with flat file?

[Bernd Schmelter]

I`m using  Dovecot 2.0  with only one lokal user, so it`s imho overkill to use 
mysql.
plugin quota with flat file running fine.

It's possible expire also running with flat file? What's syntax in dovecot.conf 
(expire
= file:??? and expire_dict?)


Benn