Public key authentication on openssh for windows can't open authorized_keys

I'm testing out the openssh stuff for windows and I'm having trouble getting public keys to work.

I have followed most of the instructions here and I've generated the necessary keys on my other machine, and I have pasted the public key into c:/users/(my-useame)/.ssh/authorized_keys on the machine that is on my server.

When I run sshd.exe -d I see the client trying to coect, but I get this message when it tries to authenticate the key.

debug1: trying public key file C
debug1: Could not open authorized keys 'C': The system caot find the file specified.

I'm pretty sure my sshd_config is correct, but it still seems to be looking for a file named 'C' instead of .ssh/authorized_keys like it says in the sshd_config. Any ideas?