--- Python-3.8.0/Lib/importlib/_bootstrap_external.py.orig	2019-12-21 14:31:23.806479400 +0100
+++ Python-3.8.0/Lib/importlib/_bootstrap_external.py	2019-12-21 14:34:37.093867400 +0100
@@ -1603,6 +1603,11 @@
                 continue
     else:
         raise ImportError('importlib requires posix or nt')
+
+    if 'MSYSTEM' in os_module.environ:
+        path_separators = path_separators[::-1]
+        path_sep = path_separators[0]
+
     setattr(self_module, '_os', os_module)
     setattr(self_module, 'path_sep', path_sep)
     setattr(self_module, 'path_separators', ''.join(path_separators))
