fix encoding on Windows

CHANGELOG.md

@@ -5,6 +5,12 @@ 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/).
 
+## [0.85.1] - 2024-10-26
+
+### Fixed
+
+- Fixed encoding issue when saving files such as screenshots on Windows
+
 ## [0.85.0] - 2024-10-25
 
 ### Changed
@@ -2483,6 +2489,7 @@ https://textual.textualize.io/blog/2022/11/08/version-040/#version-040
 - New handler system for messages that doesn't require inheritance
 - Improved traceback handling
 
+[0.85.1]: https://github.com/Textualize/textual/compare/v0.85.0...v0.85.1
 [0.85.0]: https://github.com/Textualize/textual/compare/v0.84.0...v0.85.0
 [0.84.0]: https://github.com/Textualize/textual/compare/v0.83.0...v0.84.0
 [0.83.0]: https://github.com/Textualize/textual/compare/v0.82.0...v0.83.0

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "textual"
-version = "0.85.0"
+version = "0.85.1"
 homepage = "https://github.com/Textualize/textual"
 repository = "https://github.com/Textualize/textual"
 documentation = "https://textual.textualize.io/"

src/textual/driver.py

@@ -240,7 +240,9 @@ def deliver_binary(
 
         def save_file_thread(binary: BinaryIO | TextIO, mode: str) -> None:
             try:
-                with open(save_path, mode) as destination_file:
+                with open(
+                    save_path, mode, encoding=encoding or "utf-8"
+                ) as destination_file:
                     read = binary.read
                     write = destination_file.write
                     chunk_size = 1024 * 64