Cross platform mobile app development on Windows is an amazing way to reach a broader audience with the convenience of a single codebase. Here’s a straightforward guide to get you started:

1. Choose the Right Framework: 

Select a cross-platform framework like React Native, Flutter, or Xamarin. These frameworks allow you to write code once and run it on both Android and iOS devices.

2. Development Environment Setup: 

Make sure that the Windows machine has all the necessary tools installed. For React Native, you’ll need Node.js, the React Native CLI, and Android Studio. For Flutter, install the Flutter SDK and Android Studio. Xamarin requires Visual Studio and so on.

3. Emulator Installation: 

An emulator allows app testing without any need of a physical device. Android Studio comes with an Android emulator, while iOS emulation requires additional steps using third-party tools or a connected macOS machine.

4. Code Writing: 

Choose a framework to begin with the app coding. Utilize the extensive libraries and plugins available to add functionality and enhance your app’s performance.

5. Test, Debug, Retest: 

Perform regular testing of the app on different emulators and devices. Debug any issues using the tools provided by your framework and IDE.

6. Build and Deploy: 

Once the app is ready, work with the build tools of your framework to create deployable app files. Submit the mobile app to its relevant Google Play Store and the Apple App Store.

Now you can effectively develop cross-platform mobile apps on Windows to ensure a smooth and efficient development process.