Agent.parent_dir is used only in MOTD [update](https://github.com/rightscale/right_link/blob/master/lib/instance/instance_state.rb#L492), so Windows is not an issue here.
```
~/dev/right_link_package/instance/right_link >> grep -Enr "AgentConfig.+parent_dir" .
./lib/instance/instance_state.rb:492:      etc = File.join(AgentConfig.parent_dir, 'etc')
~/dev/right_link_package/instance/right_link >>
```