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# Windows App folder

Host Platform Support (Platform support)
macOS | Windows | Linux
--- | --- | ---
x86‑64 | arm64 | x86 | x86‑64 | arm64 | x86 | x86‑64 | arm | arm64
|  |  | ● |  |  |  |  |

A Windows App folder is a stub binary, along with a collection of subfolders that contain the Python code for the app and the Python runtime libraries.

A Windows App folder is the default Briefcase output format when running on Windows. However, you can explicitly specify the use of the Windows App folder backend by using `briefcase <command> windows app`.

All Windows apps, regardless of output format, use the same icon formats, have the same set of configuration and runtime options, have the same permissions, and have the same platform quirks. See the documentation on Windows apps for more details.

## Application configuration

Any configuration option specified in the `tool.briefcase.app.<appname>.windows` section of your `pyproject.toml` file will be used by the Windows App folder backend. To specify a setting that will only be used by Windows App folders and not other Windows output formats, put the setting in a `tool.briefcase.app.<appname>.windows.app` section of your `pyproject.toml`.