Different autolog_path for chats and queries

Hi there,

I try to keep my IRC logs in sync with the ones of Pidgin. Therefore I 
tried to imitate Pidgins autolog_path. That works good except that 
Pidgin adds ".chat" to folders that contain the log files of an IRC 
channel. Is there a way to do this on irssi for chats (without doing it 
for queries)?

To make it clear this is what the file structure looks like in Pidgin:
irc/irc.freenode.net/#irssi.chat/2011-10-21.124456+0200CET.txt
irc/irc.freenode.net/ploppy/2011-06-13.144823+0200CET.txt

Thank you,
Konrad