BUG #5921: pg_dump asks for password

The following bug has been logged online:

Bug reference: 5921
Logged by: sandyt
Email address: sandy(at)mcw(dot)co(dot)il
PostgreSQL version: 8.3.8
Operating system: windows 2008 server (64 bit)
Description: pg_dump asks for password
Details:

We want to be able to run a nightly backup using the pg_dump command.

Unfortunately, even with the pg_hba.conf fix of adding host postgres …
trust,

It still asks for a password.

1. Is this a 64bit issue? If the server was 32bit, would it not ask for a
password?

2. Is there a way of running a dos script that would run the pg_dump
providing a password when prompted?

3. Is there a way of running the pg_dump with a user that doesn't have a
password?

Thanks