Bundle MSIX packages

This article describes the process of creating a bundle after converting x86 and x64 versions of your Windows installers using the MSIX Packaging Tool.

By bundling the multiple architecture versions of your installer into one entity, only the bundle needs to be uploaded to the Store or another distribution location. The Windows 10 deployment platform is aware of the .msixbundle package type and will only download the files that are applicable for your device's architecture. Keep in mind that if you decide to distribute an .msixbundle for a particular app, you cannot revert back to distributing just an MSIX package.

The following section presents a step-by-step approach to build an .msixbundle. It assumes that you have already converted your existing x86 and x64 versions of the Windows installer to MSIX packages.

Setup

You will need the following setup to successfully build an MSIX bundle:

• Windows 10 SDK (version 1809 or above)
• Converted x64 and x86 MSIX packages

Step 1: Find MakeAppx.exe

MakeAppx.exe is a tool available in the Windows 10 SDK that allows for packaging and bundling of MSIX packages. You will use this tool to bundle the two MSIX packages together.

MakeAppx.exe can be used to extract the file contents of a Windows 10 app package or bundle. It also encrypts and decrypts app packages and bundles.

After the Windows 10 SDK is installed, MakeAppx.exe is usually found here:

• [x86] - C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x86\MakeAppx.exe
• [x64] - C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x64\MakeAppx.exe

Step 2: Bundle the packages

The easiest way to bundle packages with MakeApp.exe is to add all the packages that you want to bundle together in one folder. The directory must be free of everything else except the packages that need to be bundled.

Move the app packages that you want to bundle into one directory, as shown in the following screenshot.

MakeAppx.exe has the following command line syntax.

C:\> "C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x86\MakeAppx.exe" bundle /d input_directorypath 
/p <filepath>.msixbundle

Here is an example command.

C:\> "C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x86\MakeAppx.exe" bundle /d c:\AppPackages\ 
/p c:\MyLOBApp_10.0.0.0_ph32m9x8skttmg.msixbundle

After running the command, an unsigned .msixbundle will be created in the path specified. Packages do not need to be signed before bundling.

Step 3: Sign the bundle

After you create the bundle, you must sign the package before you can distribute the app to your users or install it.

To sign a package, you will need a general code signing certificate and use SignTool.exe from the Windows 10 SDK.

We strongly recommend that you use a trusted cert from certificate authority as that allows for the package to be distributed and deployed on your end users devices seamlessly. Once you have access to the private certificate (.pfx file), you can sign the package as shown below.

SignTool.exe has the following command line syntax.

C:\> "C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x86\SignTool.exe" sign /fd <Hash Algorithm> /a 
/f <Path to Certificate>.pfx /p <Your Password> <File path>.msixbundle

Here is an example command.

C:\> "C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x86\SignTool.exe" sign /fd SHA256 /a 
/f c:\private-cert.pfx /p aaabbb123 c:\MyLOBApp_10.0.0.0_ph32m9x8skttmg.msixbundle

For more information about signing app packages with SignTool.exe, see this article.

After successfully signing the bundle, you are ready to host it on a network share or on any content distribution network to distribute it to your users.