Question : Problem: Location of authorized_keys file

I just set up my first SFTP server (SSHWindows or OpenSSH for Windows) on a client Windows 2000 Server.  Here's where things stand:
1. Installation complete.
2. Password file is setup.
3. Home directory changed to a Windows share named SFTP.
4. Firewall setup for Port 22.
5. Successful client logon using Filezilla from my home network with a user / password combo.
6. EE expert DaveHowe provided me with a very useful explanation of the SFTP public key / private key concept and the authorized_keys file.  Dave suggested that I place the public key in $HOME/.ssh/authorized_keys or in an alternate location if my server isn't a "true" SSH server.  
7. I poked around a bit on the server.  I ran ssh-keygen and produced authorized_keys and authorized_keys.pub files in the ...\OpenSSH\bin folder.  Will the files work from this location?  (I suspect they won't.)  I'm unable to create $HOME/.ssh/authorized_keys because ".ssh" is an invalid name for a Windows folder.  
8. I'm also struggling with Filezilla.  I couldn't locate a way to reference a private key using the Site Manager.  Is this functionality beyond Filezilla?  

Answer : Problem: Location of authorized_keys file

On second thought - You can keep keys wherever You want (ssh -i path-to-key).
And for authorized_keys, there server config option
AuthorizedKeysFile D:\sftp\%u\.ssh