{"id":53758,"date":"2025-09-01T14:38:11","date_gmt":"2025-09-01T04:38:11","guid":{"rendered":"https:\/\/www.cloudproinc.com.au\/?p=53758"},"modified":"2025-09-01T14:49:28","modified_gmt":"2025-09-01T04:49:28","slug":"publish-winui-app-to-windows-11-machines","status":"publish","type":"post","link":"https:\/\/cloudproinc.azurewebsites.net\/index.php\/2025\/09\/01\/publish-winui-app-to-windows-11-machines\/","title":{"rendered":"Publish WinUI App to Windows 11 Machines"},"content":{"rendered":"\n<p>In this post, &#8220;Publish WinUI App to Windows 11 Machines&#8221; we\u2019ll walk through what WinUI 3 is, why you should use it, and how to package and distribute your app with a <strong>self-trusted certificate<\/strong> so users can install it safely.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>When building modern desktop applications for Windows 11, one of the most flexible approaches is using <strong>WinUI 3<\/strong>. However, developers often wonder how to distribute their apps without going through the <strong>Microsoft Store<\/strong>. This process is known as <strong>sideloading<\/strong>, and it allows you to publish and install your WinUI app directly on Windows 11 machines. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-winui-3\">What is WinUI 3?<\/h2>\n\n\n\n<p><strong>WinUI 3<\/strong> is Microsoft\u2019s latest UI framework for building modern Windows desktop applications. It is part of the <strong>Windows App SDK<\/strong>, which means it\u2019s <strong>decoupled from the Windows operating system<\/strong>. Unlike older frameworks such as UWP (Universal Windows Platform) or WPF (Windows Presentation Foundation), WinUI 3 can evolve independently of Windows updates. This gives developers faster access to new features and UI improvements without waiting for OS releases.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-benefits-of-winui-3\">Benefits of WinUI 3:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Modern UI:<\/strong> Provides native controls styled for Windows 11, giving apps a fresh, consistent look.<\/li>\n\n\n\n<li><strong>Decoupled SDK:<\/strong> Updates to the SDK are shipped separately, so you can always target the latest features.<\/li>\n\n\n\n<li><strong>Backward compatibility:<\/strong> Apps can run on Windows 10 and Windows 11, increasing your audience reach.<\/li>\n\n\n\n<li><strong>Developer flexibility:<\/strong> Works with .NET 5\/6\/7+ and C++ WinRT, giving you freedom of language and tooling.<\/li>\n<\/ul>\n\n\n\n<p>In short, WinUI 3 allows developers to build future-ready apps with a modern user interface and rapid access to updates.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-sideloading\">Why Sideloading?<\/h2>\n\n\n\n<p>The default way to distribute a Windows app is through the <strong>Microsoft Store<\/strong>. But in enterprise or testing scenarios, you might want more control. That\u2019s where <strong>sideloading<\/strong> comes in.<\/p>\n\n\n\n<p><strong>Sideloading<\/strong> means installing an app package (MSIX or APPX) directly on a Windows 11 machine, bypassing the Store. This is especially useful when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You\u2019re testing internally before public release.<\/li>\n\n\n\n<li>You\u2019re distributing apps within a company or private group.<\/li>\n\n\n\n<li>You don\u2019t want to publish to the Store for licensing or business reasons.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-prerequisites-for-sideloading-a-winui-app\">Prerequisites for Sideloading a WinUI App<\/h2>\n\n\n\n<p>To sideload a WinUI 3 app, you need a <strong>code-signing certificate<\/strong>. Since the app isn\u2019t coming from the Store, Windows needs a way to verify it\u2019s trustworthy. That\u2019s where a <strong>self-trusted certificate<\/strong> comes in.<\/p>\n\n\n\n<p>Here\u2019s what you need:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>MSIX Package<\/strong> of your WinUI app (created during the publishing process in Visual Studio).<\/li>\n\n\n\n<li><strong>Certificate (PFX file)<\/strong> generated for signing the package.<\/li>\n\n\n\n<li>Installation of that certificate on each target machine in the <strong>Trusted Root Certification Authorities<\/strong> store.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-1-create-and-sign-your-app-package\">Step 1: Create and Sign Your App Package<\/h2>\n\n\n\n<p>In <strong>Visual Studio<\/strong>, once your WinUI 3 app is ready:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Right-click your project > <strong>Publish<\/strong> > <strong>Create App Packages (MSIX)<\/strong>.<\/li>\n\n\n\n<li>Select <strong>Sideloading<\/strong> as the distribution method.<\/li>\n\n\n\n<li>Visual Studio will prompt you to create or use a certificate.\n<ul class=\"wp-block-list\">\n<li>You can generate a <strong>self-signed certificate<\/strong> if you don\u2019t already have one.<\/li>\n\n\n\n<li>Export it as a <code>.pfx<\/code> file with a password.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"522\" height=\"239\" data-src=\"\/wp-content\/uploads\/2025\/09\/image-1.png\" alt=\"\" class=\"wp-image-53760 lazyload\" data-srcset=\"\/wp-content\/uploads\/2025\/09\/image-1.png 522w, \/wp-content\/uploads\/2025\/09\/image-1-300x137.png 300w, \/wp-content\/uploads\/2025\/09\/image-1-480x220.png 480w\" data-sizes=\"(max-width: 522px) 100vw, 522px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 522px; --smush-placeholder-aspect-ratio: 522\/239;\" \/><\/figure>\n\n\n\n<p>This certificate will sign your MSIX package, ensuring the installer knows the app has not been tampered with.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-2-install-the-certificate-on-target-machines\">Step 2: Install the Certificate on Target Machines<\/h2>\n\n\n\n<p>For the app to install correctly, Windows 11 needs to trust the signing certificate:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Copy the certificate <code>.cer<\/code> file to the target machine.<\/li>\n\n\n\n<li>Double-click it and choose <strong>Install Certificate<\/strong>.<\/li>\n\n\n\n<li>Select <strong>Local Machine<\/strong> > <strong>Place all certificates in the following store<\/strong>.<\/li>\n\n\n\n<li>Browse and select <strong>Trusted Root Certification Authorities<\/strong>.<\/li>\n\n\n\n<li>Complete the wizard and confirm the certificate installation.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"371\" height=\"113\" data-src=\"\/wp-content\/uploads\/2025\/09\/image.png\" alt=\"\" class=\"wp-image-53759 lazyload\" data-srcset=\"\/wp-content\/uploads\/2025\/09\/image.png 371w, \/wp-content\/uploads\/2025\/09\/image-300x91.png 300w\" data-sizes=\"(max-width: 371px) 100vw, 371px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 371px; --smush-placeholder-aspect-ratio: 371\/113;\" \/><\/figure>\n\n\n\n<p>Now, Windows 11 trusts your app package.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-3-install-the-winui-app\">Step 3: Install the WinUI App<\/h2>\n\n\n\n<p>Once the certificate is installed:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Copy the <strong>MSIX package<\/strong> to the target machine.<\/li>\n\n\n\n<li>Double-click it to launch the installer.<\/li>\n\n\n\n<li>Windows will show that the app is from a trusted publisher (your certificate).<\/li>\n\n\n\n<li>Complete the installation, and your WinUI app will run like any other installed program.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-advantages-of-this-approach\">Advantages of This Approach<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>No Store dependency:<\/strong> You control when and how the app is distributed.<\/li>\n\n\n\n<li><strong>Enterprise-friendly:<\/strong> Perfect for corporate environments where internal apps need distribution.<\/li>\n\n\n\n<li><strong>Security:<\/strong> The signed package ensures integrity and trustworthiness.<\/li>\n\n\n\n<li><strong>Flexibility:<\/strong> You can update and re-sign new versions as often as needed.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-final-thoughts\">Final Thoughts<\/h2>\n\n\n\n<p>Publishing a <strong>WinUI 3 app<\/strong> to Windows 11 machines without using the Microsoft Store is straightforward with sideloading. By creating a <strong>self-trusted certificate<\/strong>, installing it on each machine, and packaging your app with MSIX, you gain complete control over distribution while maintaining security and trust.<\/p>\n\n\n\n<p>WinUI 3 brings a modern development experience to Windows apps, and sideloading ensures you can deliver them directly to your users\u2014whether for internal testing, enterprise environments, or custom deployments. If you\u2019re building modern desktop apps today, mastering this workflow is essential for flexibility and reach.<\/p>\n\n\n\n<ul class=\"wp-block-yoast-seo-related-links yoast-seo-related-links\">\n<li><a href=\"https:\/\/www.cloudproinc.com.au\/index.php\/2025\/05\/13\/publish-a-blazor-net-app-with-vs-code-to-azure\/\">Publish a Blazor .NET App With VS Code to Azure<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cloudproinc.com.au\/index.php\/2024\/09\/10\/how-to-translate-text-using-azure-ai-translator-and-net\/\">How to Translate Text Using Azure AI Translator and .NET<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.cloudproinc.com.au\/index.php\/unleash-the-full-potential-of-microsoft-intune-with-cpi-consulting\/\">Unleash the Full Potential of Microsoft Intune with CPI Consulting<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cloudproinc.com.au\/index.php\/2024\/07\/25\/assigning-local-admins-to-windows-11-through-intune\/\">Assigning Local Admins to Windows 11 through Intune<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cloudproinc.com.au\/index.php\/2025\/02\/19\/add-language-keyboards-to-windows-machines-with-intune\/\">Add Language Keyboards to Windows Machines with Intune<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In this post, &#8220;Publish WinUI App to Windows 11 Machines&#8221; we\u2019ll walk through what WinUI 3 is, why you should use it, and how to package and distribute your app with a self-trusted certificate so users can install it safely.<\/p>\n","protected":false},"author":1,"featured_media":53762,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Publish WinUI App to Windows 11 Machines","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Learn how to publish WinUI app to Windows 11 machines without using the Microsoft Store. Explore the sideloading process.","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[13,83],"tags":[],"class_list":["post-53758","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-winui"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Publish WinUI App to Windows 11 Machines - CPI Consulting<\/title>\n<meta name=\"description\" content=\"Learn how to publish WinUI app to Windows 11 machines without using the Microsoft Store. 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