pg_hba.conf and password files

Hi,

I use a pg_hba.conf like this:

local    all                        trust
host    all    127.0.0.1    255.255.255.255        trust
host    all    134.93.64.0    255.255.255.0        password    usr.txt

In usr.txt I made one entry "test:test". When I connect with Access, the DSN 
dialog appears, and I enter "test" and "test" in the corresponding fields for 
username and password. The connect fails, and the postgres.log says: "user 
'wagner' not found in password file". It seems that the username "test" does 
not make it to the backend, and my Windows username "wagner" is sent instead.

Any hints?

Thanks,

Markus