diff --git a/a1_swap_mod_packer/gui.py b/a1_swap_mod_packer/gui.py
index 3a1833d..00f2032 100644
--- a/a1_swap_mod_packer/gui.py
+++ b/a1_swap_mod_packer/gui.py
@@ -28,7 +28,7 @@ if sys.platform.startswith("win") and "QT_QPA_PLATFORM" not in os.environ:
 
 try:
     from PySide6.QtCore import QEasingCurve, QEvent, QPropertyAnimation, Qt, QTimer, QUrl
-    from PySide6.QtGui import QDragEnterEvent, QDragMoveEvent, QDropEvent, QFont, QKeyEvent, QPixmap
+    from PySide6.QtGui import QDragEnterEvent, QDragMoveEvent, QDropEvent, QFont, QIcon, QKeyEvent, QPixmap
     from PySide6.QtWidgets import (
         QApplication,
         QAbstractItemView,
@@ -73,7 +73,7 @@ from .core import (
     read_3mf_summary,
 )
 from .builder import preview_members_for_gcode_member, resolve_output_gcode_member
-from .paths import default_patch_config_path, default_swap_gcode_dir, user_settings_path
+from .paths import default_patch_config_path, default_swap_gcode_dir, program_root, user_settings_path
 from .planning import (
     DEFAULT_OUTPUT_PATTERN,
     OutputNamingOptions,
@@ -1446,6 +1446,9 @@ def main() -> int:
     freeze_support()
     app = QApplication(sys.argv)
     app.setFont(QFont("Segoe UI", 10))
+    icon_path = program_root() / "x.png"
+    if icon_path.exists():
+        app.setWindowIcon(QIcon(str(icon_path)))
     window = MainWindow()
     window.show()
     return app.exec()
diff --git a/build_win.cmd b/build_win.cmd
index 65e3b05..841562b 100644
--- a/build_win.cmd
+++ b/build_win.cmd
@@ -38,6 +38,9 @@ if %ERRORLEVEL% GEQ 8 exit /b %ERRORLEVEL%
 copy /Y "gcode_patches.ini" "%DIST%\gcode_patches.ini" >nul
 if errorlevel 1 exit /b %ERRORLEVEL%
 
+copy /Y "x.png" "%DIST%\x.png" >nul
+if errorlevel 1 exit /b %ERRORLEVEL%
+
 echo.
 echo Build done: %DIST%
 exit /b 0
diff --git a/x.png b/x.png
new file mode 100644
index 0000000..55170cb
Binary files /dev/null and b/x.png differ