Sign & Sideload a Uno Platform WinUI App | MSIX Self-Signed Certificate Tutorial

Learn how to digitally sign and sideload a Uno Platform WinUI desktop app using an MSIX package and a self-signed certificate.
We cover everything from creating the certificate, signing your MSIX, to installing it on a target Windows machine—step by step.
Remember: An MSIX package must be signed so Windows can verify the publisher and integrity, enable frictionless installs, and ensure safe updates. No signature → no trust → the OS will block or warn about installation.
Perfect for developers deploying apps outside the Microsoft Store or testing internally.
⏱ Chapters
0:00 Intro
0:18 Why Signing Matters
0:56 Creating a new Uno platform Win UI app
2:17 Exploring the AppXManifest file.
4:32 Filling in the Packaging details
4:47 Understanding Package versions
6:40 Generating self signed certificate
9:15 Packaging the app
12:03 Installing app without certificate installed
12:42 Installing certificate
13:37 Installing the app
14:45 Like,Share,Subscribe

Command to package the app:
msbuild /r /p:TargetFramework=net9.0-windows10.0.26100 /p:Configuration=Release /p:Platform=x64 /p:GenerateAppxPackageOnBuild=true /p:AppxBundle=Never /p:UapAppxPackageBuildMode=Sideloading /p:AppxPackageDir="C:/temp/output/" /p:AppxPackageSigningEnabled=true

Official Uno documentation for building a signed package:
https://platform.uno/docs/articles/un...

Watch how to create a new Uno platform project:
   • Design a Custom Theme for Your Uno App wit...  

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