Writing Bin Log to Remote Directory (no replies)

On a Windows box, what's the trick to write the bin log to a remote folder?

I have installed MySQL Community Edition on a Windows 2008 R2 server. As part of the disaster recovery, once a week I will be doing a full database backup to a folder on another server using mysqldump. I want to configure MySQL to write the bin log to the same remote server, but can't seem to get it to work.
If I set log-bin = "//servername/sharename/bin_logs/mysql-bin.logs" MySQL won't start and tells me there's a problem with the log file.

I tried mapping to the remote directory and using log-bin = "M:/mysql-bin.logs" but get the same error. When I set it to write to the local disk, it works.

Is this an issue with the file path or am I overlooking something?

Thanks!