Use to_bytes on open and to_native on load_source.

lib/ansible/plugins/loader.py

@@ -18,7 +18,7 @@ from collections import defaultdict
 
 from ansible import constants as C
 from ansible.errors import AnsibleError
-from ansible.module_utils._text import to_bytes, to_text
+from ansible.module_utils._text import to_bytes, to_native, to_text
 from ansible.parsing.utils.yaml import from_yaml
 from ansible.plugins import get_plugin_class, MODULE_CACHE, PATH_CACHE, PLUGIN_PATH_CACHE
 from ansible.utils.display import Display
@@ -350,8 +350,8 @@ class PluginLoader:
 
         with warnings.catch_warnings():
             warnings.simplefilter("ignore", RuntimeWarning)
-            with open(path, 'rb') as module_file:
-                module = imp.load_source(full_name, to_bytes(path), module_file)
+            with open(to_bytes(path), 'rb') as module_file:
+                module = imp.load_source(full_name, to_native(path), module_file)
         return module
 
     def _update_object(self, obj, name, path):