Convert XAP to APPX

Source format

XAP was the package format used by Windows Phone 7 and Windows Phone 8 apps. It contained the app executable, assets, and manifest data, and was distributed through the Windows Phone Marketplace and sideloading tools for development and testing. XAP is now a legacy format because Windows Phone has been discontinued.

Target format

APPX is the package format used by Windows 8, Windows 8.1, and later Windows app platforms, including UWP-style apps. It supports modern signing, deployment, and update mechanisms and is used for Microsoft Store distribution, enterprise deployment, and local testing. On newer Windows versions, .appx and .msix are both common package formats, with MSIX being the newer packaging standard.

Can xap be converted to appx?

Not directly. A Windows Phone XAP file cannot be reliably turned into a working APPX package by renaming the file or using a simple converter. The two formats target different app platforms, APIs, and runtime environments. In most cases, conversion means porting the app source code and repackaging it, not changing the container.

How to migrate the app

1. Check whether you have the source code. If you do, identify whether the app was built for Windows Phone Silverlight or Windows Phone 8. Older APIs, controls, and project settings may need to be replaced.
2. Open or recreate the project in Visual Studio. Use a supported version of Visual Studio with the appropriate Windows SDK installed. For a modern Windows target, create a new Windows app project and move the code over instead of trying to reuse the XAP file itself.
3. Port the app. Update UI, storage, networking, notifications, and device-specific APIs to equivalents supported by the target platform. This is usually the most time-consuming step.
4. Package the app. In Visual Studio, use Project → Publish → Create App Packages for modern Windows app packaging workflows, or the packaging options available for your project type. This produces an .appx, .appxbundle, or, on newer projects, an .msix package.
5. Test on a compatible device or emulator. Install the package on a supported Windows environment and verify that the app launches and functions correctly.

What you can do with the xap file itself

If you only need to inspect or extract a XAP, tools such as 7-Zip can open it because XAP is ZIP-based. That can help you recover assets or view the manifest, but it does not create a valid APPX package.

Best software options

Visual Studio is the best desktop tool for migration and repackaging if you have source code. 7-Zip is useful for inspection and extraction. If you need to rebuild the app for a modern Windows platform, Visual Studio with the correct SDK is the practical choice.

Online converters

There are no reputable online converters that can safely and correctly turn a legacy Windows Phone XAP into a functional APPX package. Because source-code changes and platform migration are usually required, online file conversion services are not a realistic solution.

Important limitations

XAP to APPX is not a true file-format conversion. The app usually must be rewritten or significantly adapted because Windows Phone and APPX-based Windows apps use different runtimes, APIs, and packaging rules. A direct file rename will not work. Even if the XAP contents are extracted, the app may still fail to build or run on modern Windows without substantial code changes. Many legacy Windows Phone apps also depend on deprecated services or APIs that no longer exist.