Win path (#202)

* fix for Windows paths

* version bump

Author: willmcgugan

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [2.0.27] - Unreleased
+
+### Fixed for Winows paths #152
+
 ## [2.0.26] - 2018-07-26
 
 ### Fixed

fs/_version.py

@@ -1,3 +1,3 @@
 """Version, used in module and setup.py.
 """
-__version__ = "2.0.26"
+__version__ = "2.0.27a0"

fs/osfs.py

@@ -106,8 +106,9 @@ def __init__(
         if isinstance(root_path, bytes):
             root_path = fsdecode(root_path)
         self.root_path = root_path
-        _root_path = fsdecode(fspath(root_path))
-        _root_path = os.path.expanduser(os.path.expandvars(root_path))
+        _drive, _root_path = os.path.splitdrive(fsdecode(fspath(root_path)))
+        _root_path = _drive + (_root_path or '/') if _drive else _root_path
+        _root_path = os.path.expanduser(os.path.expandvars(_root_path))
         _root_path = os.path.normpath(os.path.abspath(_root_path))
         self._root_path = _root_path