Don't search powershell modules unless using the winrm connection.

lib/ansible/modules/core

@@ -1 +1 @@
-Subproject commit 617a52b20d512a4eb5e88fdc76658b220ff80266
+Subproject commit 9b35a391213fe87834af5ebc907109de2bc0005f

lib/ansible/runner/__init__.py

@@ -1213,7 +1213,7 @@ class Runner(object):
 
         # Search module path(s) for named module.
         module_suffixes = getattr(conn, 'default_suffixes', None)
-        module_path = utils.plugins.module_finder.find_plugin(module_name, module_suffixes)
+        module_path = utils.plugins.module_finder.find_plugin(module_name, module_suffixes, transport=self.transport)
         if module_path is None:
             module_path2 = utils.plugins.module_finder.find_plugin('ping', module_suffixes)
             if module_path2 is not None:

lib/ansible/utils/plugins.py

@@ -159,14 +159,17 @@ class PluginLoader(object):
             if directory not in self._extra_dirs:
                 self._extra_dirs.append(directory)
 
-    def find_plugin(self, name, suffixes=None):
+    def find_plugin(self, name, suffixes=None, transport=''):
         ''' Find a plugin named name '''
 
         if not suffixes:
             if self.class_name:
                 suffixes = ['.py']
             else:
-                suffixes = ['', '.ps1', '.py']
+                if transport == 'winrm':
+                    suffixes = ['.ps1', '']
+                else:
+                    suffixes = ['.py', '']
 
         for suffix in suffixes:
             full_name = '%s%s' % (name, suffix)