chore: Add unpackaged-app example (#45)

Author: rctlmk

Cargo.lock

@@ -31,3 +31,6 @@ windows-version = "0.1"
   "Data_Xml_Dom",
   "UI_Notifications"
 ]
+
+[target.'cfg(windows)'.dev-dependencies]
+windows-registry = "0.5.0"

Cargo.toml

@@ -0,0 +1,46 @@
+// Copyright 2017-2022 allenbenz <[email protected]>
+// Copyright 2022-2025 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+use std::{thread::sleep, time::Duration};
+
+use tauri_winrt_notification::Toast;
+use windows_registry::CURRENT_USER;
+
+// App's AUMID (Application User Model Id), should be unique and no longer than 129 characters.
+// https://learn.microsoft.com/en-us/windows/apps/design/shell/tiles-and-notifications/send-local-toast-other-apps#aumid-restrictions
+const APP_ID: &str = "tauri.UnpackagedAppWinRtNotificationExample";
+
+// App's display name
+const APP_NAME: &str = "Unpackaged App";
+
+fn main() -> windows_registry::Result<()> {
+    init_registry()?;
+
+    Toast::new(APP_ID)
+        .title("Notification from an unpackaged app")
+        .scenario(tauri_winrt_notification::Scenario::Reminder)
+        .add_button("OK", "ok")
+        .show()
+        .expect("unable to send notification");
+
+    // The notification won't appear if we clean up registry too early
+    sleep(Duration::from_secs(3));
+    clean_up_registry()
+}
+
+// Create registry key for this example
+fn init_registry() -> windows_registry::Result<()> {
+    let icon_path = std::env::current_dir()?.join(r"resources\tauri.png");
+
+    let key = CURRENT_USER.create(format!(r"SOFTWARE\Classes\AppUserModelId\{APP_ID}"))?;
+    key.set_string("DisplayName", APP_NAME)?;
+    key.set_string("IconBackgroundColor", "0")?;
+    key.set_hstring("IconUri", &icon_path.as_path().into())
+}
+
+// Remove this example from the registry
+fn clean_up_registry() -> windows_registry::Result<()> {
+    CURRENT_USER.remove_tree(format!(r"SOFTWARE\Classes\AppUserModelId\{APP_ID}"))
+}