checking in before refactoring interpolation

envs/utils_windows.go

@@ -0,0 +1,15 @@
+//go:build windows
+
+package envs
+
+import (
+	"golang.org/x/sys/windows/registry"
+)
+
+// interpolateString takes string s and performs environment variable interpolation/substitution on it.
+func interpolateString(s string) (subbed string, err error) {
+
+	subbed, err = registry.ExpandString(os.ExpandEnv(s))
+
+	return
+}