It looks like you're hardcoding this to relative. I'd expect something that looks at the path for a leading slash/backslash versus a drive letter or the \\?\ prefix, and makes a determination then.

We do expect in the future that paths with a leading [back]slash and no drive letter be associated with the system drive, see [CHEF-4427](https://tickets.opscode.com/browse/CHEF-4427).