Prepare to package an app (Desktop Bridge)
This article lists the things you need to know before you package your desktop app. You might not have to do much to get your app ready for the packaging process, but if any of the items below applies to your application, you need to address it before packaging. Remember that the Microsoft Store handles licensing and automatic updating for you, so you can remove any features that relate to those tasks from your codebase.
The Desktop Bridge was introduced in Windows 10, version 1607, and it can only be used in projects that target Windows 10 Anniversary Edition (10.0; Build 14393) or a later release in Visual Studio.
Your app uses a version of .NET earlier than 4.6.1. Only .NET 4.6.1 is supported. You'll have to retarget your app to .NET 4.6.1 before you package it.
Your app always runs with elevated security privileges. Your app needs to work while running as the interactive user. Users who install your app from the Microsoft Store may not be system administrators, so requiring your app to run elevated means that it won't run correctly for standard users. Apps that require elevation for any part of their functionality won't be accepted in the Microsoft Store.
Your app requires a kernel-mode driver or a Windows service. The bridge is suitable for an app, but it does not support a kernel-mode driver or a Windows service that needs to run under a system account. Instead of a Windows service, use a background task.
Your app's modules are loaded in-process to processes that are not in your Windows app package. This isn't permitted, which means that in-process extensions, like shell extensions, aren't supported. But if you have two apps in the same package, you can do inter-process communication between them.
Your app uses a custom Application User Model ID (AUMID). If your process calls SetCurrentProcessExplicitAppUserModelID to set its own AUMID, then it may only use the AUMID generated for it by the app model environment/Windows app package. You can't define custom AUMIDs.
Your app modifies the HKEY_LOCAL_MACHINE (HKLM) registry hive. Any attempt by your app to create an HKLM key, or to open one for modification, will result in an access-denied failure. Remember that your app has its own private virtualized view of the registry, so the notion of a user- and machine-wide registry hive (which is what HKLM is) does not apply. You will need to find another way of achieving what you were using HKLM for, like writing to HKEY_CURRENT_USER (HKCU) instead.
Your app uses a ddeexec registry subkey as a means of launching another app. Instead, use one of the DelegateExecute verb handlers as configured by the various Activatable* extensions in your app package manifest.
Your app writes to the AppData folder or to the registry with the intention of sharing data with another app. After conversion, AppData is redirected to the local app data store, which is a private store for each UWP app.
All entries that your app writes to the HKEY_LOCAL_MACHINE registry hive are redirected to an isolated binary file and any entries that your app writes to the HKEY_CURRENT_USER registry hive are placed into a private per-user, per-app location. For more details about file and registry redirection, see Behind the scenes of the Desktop Bridge.
Use a different means of inter-process data sharing. For more info, see Store and retrieve settings and other app data.
Your app writes to the install directory for your app. For example, your app writes to a log file that you put in the same directory as your exe. This isn't supported, so you'll need to find another location, like the local app data store.
Your app installation requires user interaction. Your app installer must be able to run silently, and it must install all of its prerequisites that aren't on by default on a clean OS image.
Your app uses the Current Working Directory. At runtime, your packaged desktop app won't get the same Working Directory that you previously specified in your desktop .LNK shortcut. You need to change your CWD at runtime if having the correct directory is important for your app to function correctly.
Your app requires UIAccess. If your application specifies
requestedExecutionLevelelement of the UAC manifest, conversion to UWP isn't supported currently. For more info, see UI Automation Security Overview.
Your app exposes COM objects. Processes and extensions from within the package can register and use COM & OLE servers, both in-process and out-of-process (OOP). The Creators Update adds Packaged COM support which provides the ability to register OOP COM & OLE servers that are now visible outside the package. See COM Server and OLE Document support for Desktop Bridge.
Packaged COM support works with existing COM APIs, but will not work for application extensions that rely upon directly reading the registry, as the location for Packaged COM is in a private location.
Your app exposes GAC assemblies for use by other processes. In the current release, your app cannot expose GAC assemblies for use by processes originating from executables external to your Windows app package. Processes from within the package can register and use GAC assemblies as normal, but they will not be visible externally. This means interop scenarios like OLE will not function if invoked by external processes.
Your app is linking C runtime libraries (CRT) in an unsupported manner. The Microsoft C/C++ runtime library provides routines for programming for the Microsoft Windows operating system. These routines automate many common programming tasks that are not provided by the C and C++ languages. If your app utilizes C/C++ runtime library, you need to ensure it is linked in a supported manner.
Visual Studio 2017 supports both static and dynamic linking, to let your code use common DLL files, or static linking, to link the library directly into your code, to the current version of the CRT. If possible, we recommend your app use dynamic linking with VS 2017.
Support in previous versions of Visual Studio varies. See the following table for details:
Visual Studio version Dynamic linking Static linking 2005 (VC 8) Not supported Supported 2008 (VC 9) Not supported Supported 2010 (VC 10) Supported Supported 2012 (VC 11) Supported Not supported 2013 (VC 12) Supported Not supported 2015 and 2017 (VC 14) Supported Supported
Note: In all cases, you must link to the latest publically available CRT.
Your app installs and loads assemblies from the Windows side-by-side folder. For example, your app uses C runtime libraries VC8 or VC9 and is dynamically linking them from Windows side-by-side folder, meaning your code is using the common DLL files from a shared folder. This is not supported. You will need to statically link them by linking to the redistributable library files directly into your code.
Your app uses a dependency in the System32/SysWOW64 folder. To get these DLLs to work, you must include them in the virtual file system portion of your Windows app package. This ensures that the app behaves as if the DLLs were installed in the System32/SysWOW64 folder. In the root of the package, create a folder called VFS. Inside that folder create a SystemX64 and SystemX86 folder. Then, place the 32-bit version of your DLL in the SystemX86 folder, and place the 64-bit version in the SystemX64 folder.
Your app uses a VCLibs framework package. The VCLibs libraries can be directly installed from the Microsoft Store if they are defined as a dependency in the Windows app package. For example, if your app uses Dev11 VCLibs packages, make the following change to your app package manifest: Under the
<PackageDependency Name="Microsoft.VCLibs.110.00.UWPDesktop" MinVersion="11.0.24217.0" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" />
During installation from the Microsoft Store, the appropriate version (x86 or x64) of the VCLibs framework will get installed prior to the installation of the app.
The dependencies will not get installed if the app is installed by sideloading. To install the dependencies manually on your machine, you must download and install the appropriate VCLibs framework package for Desktop Bridge. For more information about these scenarios, see Using Visual C++ Runtime in a Centennial project.
Your app contains a custom jump list. There are several issues and caveats to aware of when using jump lists.
Your app's architecture does not match the OS. Jump lists currently do not function correctly if the app and OS architectures do not match (e.g., an x86 app running on x64 Windows). At this time, there is no workaround other than to recompile your app to the matching architecture.
Your app creates jump list entries and calls ICustomDestinationList::SetAppID or SetCurrentProcessExplicitAppUserModelID. Do not programmatically set your AppID in code. Doing so will cause your jump list entries to not appear. If your app needs a custom Id, specify it using the manifest file. Refer to Package an app manually (Desktop Bridge) for instructions. The AppID for your application is specified in the YOUR_PRAID_HERE section.
Your app adds a jump list shell link that references an executable in your package. You cannot directly launch executables in your package from a jump list (with the exception of the absolute path of an app’s own .exe). Instead, register an app execution alias (which allows your packaged desktop app to start via a keyword as though it were on the PATH) and set the link target path to the alias instead. For details on how to use the appExecutionAlias extension, see Integrate your app with Windows 10 (Desktop Bridge). Note that if you require assets of the link in jump list to match the original .exe, you will need to set assets such as the icon using SetIconLocation and the display name with PKEY_Title like you would for other custom entries.
Your app adds a jump list entries that references assets in the app's package by absolute paths. The installation path of an app may change when its packages are updated, changing the location of assets (such as icons, documents, executable, and so on). If jump list entries reference such assets by absolute paths, then the app should refresh its jump list periodically (such as on app launch) to ensure paths resolve correctly. Alternatively, use the UWP Windows.UI.StartScreen.JumpList APIs instead, which allow you to reference string and image assets using the package-relative ms-resource URI scheme (which is also language, DPI, and high contrast aware).
Your app starts a utility to perform tasks. Avoid starting command utilities such as PowerShell and Cmd.exe. In fact, if users install your app onto a system that runs the Windows 10 S, then your app won’t be able to start them at all. This could block your app from submission to the Microsoft Store because all apps submitted to the Microsoft Store must be compatible with Windows 10 S.
Starting a utility can often provide a convenient way to obtain information from the operating system, access the registry, or access system capabilities. However, you can use UWP APIs to accomplish these sorts of tasks instead. Those APIs are more performant because they don’t need a separate executable to run, but more importantly, they keep the app from reaching outside of the package. The app’s design stays consistent with the isolation, trust, and security that comes with a desktop bridge app, and your app will behave as expected on systems running Windows 10 S.
Your app hosts add-ins, plug-ins, or extensions. In many cases, COM-style extensions will likely continue to work as long as the extension has not been packaged, and it installs as full trust. That's because those installers can use their full-trust capabilities to modify the registry and place extension files wherever your host app expects to find them.
However, if those extensions are packaged, and then installed as a Windows app package, they won't work because each package (the host app and the extension) will be isolated from one another. To read more about how desktop bridge isolates applications from the system, see Behind the scenes of the Desktop Bridge.
All applications and extensions that users install to a system running Windows 10 S must be installed as Windows App packages. So if you intend to package your extensions, or you plan to encourage your contributors to package them, consider how you might facilitate communication between the host app package and any extension packages. One way that you might be able to do this is by using an app service.
Your app generates code. Your app can generate code that it consumes in memory, but avoid writing generated code to disk because the Windows App Certification process can't validate that code prior to app submission. Also, apps that write code to disk won’t run properly on systems running Windows 10 S. This could block your app from submission to the Microsoft Store because all apps submitted to the Microsoft Store must be compatible with Windows 10 S.
After you've created your Windows app package, please test your app to ensure that it works correctly on systems that run Windows 10 S. All apps submitted to the Microsoft Store must be compatible with Windows 10 S. Apps that aren't compatible won't be accepted in the store. See Test your Windows app for Windows 10 S.
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