gh-85308: argparse: Use filesystem encoding for arguments file (GH-93277)

1 files changed, 3 insertions, 1 deletions

diff --git a/Lib/argparse.py b/Lib/argparse.py
index 1c5520c4b4..02e98bbf92 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -2161,7 +2161,9 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
             # replace arguments referencing files with the file content
             else:
                 try:
-                    with open(arg_string[1:]) as args_file:
+                    with open(arg_string[1:],
+                              encoding=_sys.getfilesystemencoding(),
+                              errors=_sys.getfilesystemencodeerrors()) as args_file:
                         arg_strings = []
                         for arg_line in args_file.read().splitlines():
                             for arg in self.convert_arg_line_to_args(arg_line):