I've added a Powershell port of this shell script to support Windows servers, and Derrek has merged the PR back into the trunk:
https://github.com/Appdynamics/DiskSpaceAlertExtension
The port is pretty faithful to the original shell script, uses the same configuration file and reports and alerts in the same way. So all you need to do is swap in the Powershell rather than than Bash script to monitor your Windows-based estate. Hope you find it useful!