PackDesigner > MSIX / APPX Projects > Building MSIX App Attach (VHD) Files

With MSIX app attach, the application is completely detached from the OS it runs on, and can be dynamically attached and detached without any noticeable delay. This means a clean deployment, no need to prepare golden images and all benefits of MSIX technology. The technology is currently in preview, and can be tested starting from Windows 10 May 2020 Update (2004).

The configuration for MSIX app attach builds is the same as for any MSIX build (see more information about configuring for MSIX build in section Building MSIX and .appinstaller files). The only difference is the format, which is going to be a VHD with expanded content and a set of permissions required for a proper attaching. Additionally, RayPack writes 4 scripts which can be used to test the deployment: two for staging and registering, and another two for destaging and deregistering.

In addition to VHD the CIM and VHDX formats are also supported.

More information about MSIX app attach:

https://docs.microsoft.com/en-us/azure/virtual-desktop/app-attach