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Application Compatibility Toolkit (ACT) – Win32 apps | Microsoft Docs.How to use the Compatibility Administrator utility in Windows

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Shims can also be used for running programs on different software platforms than they were developed for. Each application built for Windows imports these DLLs, and maintains a table of the address of each of these functions in memory.

Because the address of the Windows functionality is sitting in a table, it is straightforward for the shim engine to replace this address with the address of the shim DLL instead. In this particular case, the two objects are the application program and Windows, and the shim is additional code that causes the two to behave better together, as shown below:. Figure 1 Before the shim is applied, the application interacts directly with Windows.

Figure 2 After the shim is applied, the application interacts with Windows indirectly; the shim code is injected and can modify the request to Windows, the response from Windows, or both. Specifically, it leverages the nature of linking to redirect API calls from Windows to alternative code—the Shim. Consequently, a call into Windows looks like:. Specifically, you can modify the address of the Windows function resolved in the import table, and then replace it with a pointer to a function in the alternate shim code, as shown in Figure 2.

This redirection happens for statically linked. You can also shim dynamically linked. This is the cost-saving route—help the application by modifying calls to the operating system before they get there. You can fix applications without access to the source code, or without changing them at all. You incur a minimal amount of additional management overhead for the shim database , and you can fix a reasonable number of applications this way.

The downside is support as most vendors don\’t support shimmed applications. You can\’t fix every application using shims. Most people typically consider shims for applications where the vendor is out of business, the software isn\’t strategic enough to necessitate support, or they just want to buy some time.

For example, a very commonly used shim is a version-lie shim. To implement this shim, we intercept several APIs that are used to determine which version of Windows the application is running on. Normally, this information is passed on to Windows itself, and it answers truthfully.

With the shim applied, however, these APIs are intercepted. Instead of passing on the request to Windows, a different version of Windows is returned for example, Windows XP instead of Windows 7. When issues are found, we work directly with feature teams to resolve the issue before release.

Alongside the traditional app selection criteria based on popularity, we analyze changes to the operating system OS that may impact third-party apps.

Machine learning helps us build risk models that guide our team\’s validation approach, based on app behavior as compared with the OS changes. When issues are discovered, we drive fixes both internally and externally.

Not only do we partner with feature teams in identifying issues and fixing these before release, but our external partners also play a crucial role.

Our Compatibility team engages partners on critical issues before release. This includes line of business apps, common enterprise apps such as antivirus AV , VPN or virtualization software, and Microsoft first-party products. At times a few issues are not resolved before release. In these cases, the Compatibility team has a range of mitigations that can be used to ensure that our customers are minimally impacted.

These mitigations can be classified broadly as either a shim or a safeguard hold. Shims are silent to our customers and help an app or the OS function as expected.

A safeguard hold is a way to either not offer the OS for devices that may have a poor experience or notify an enterprise administrator of an issue before upgrade.

We consider all mitigations to be temporary and we work with our partners to drive for the correct fix over time. Safeguard holds are removed once an issue has been fixed—either via OS servicing or an update to the impacted third-party software. In summary, the compatible Windows 11 release is the result of the deep work done by the Compatibility team to prevent, validate, engage and mitigate issues throughout the release.

For more information on compatibility and system requirements for Windows, see:. Test Base for Microsoft is an Azure service in public preview for app developers and IT professionals that facilitates data-driven testing of applications and enables them to take advantage of intelligent testing from anywhere in the world.

Test Base will spin up a secure VM and test your applications with the latest pre-release and generally available builds of Windows in a Microsoft managed Azure environment. It helps you test your applications without the hassle, time commitment, and expenditure of setting up and maintaining complex test environments.

Additionally, it enables you to automatically test compatibility against Windows and other pre-release Windows updates on secure virtual machines VMs and get access to world-class intelligence for your applications. We recently announced support for Windows App Assure engineers are available to help resolve any issues you might experience at no additional cost with eligible subscriptions. If you do encounter an app compatibility issue on Windows 11, App Assure engineers will work with you to help you resolve the issue.

Our experts will:. This means that over By addressing the small percentage of compatibility issues that have come up, we have prevented 44 million users from ever running into a potential issue with the apps they rely on every day. We calculate that App Assure has saved more than U. Learn more about App Assure compatibility assistance here. You can also watch this introductory video on App Assure.

To connect with App Assure, visit aka. If you are interested in onboarding your applications to Test Base, please sign up today. To learn more about Test Base and started, visit our product documentation.

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Download Office App Compatibility Kit from Official Microsoft Download Center.Application Compatibility Toolkit (ACT) – Win32 apps | Microsoft Docs

Feb 05,  · Example:”C:\\Programdata\\Application X”;”Z:\\ApplicationStore\\Application X” This will redirect the application call from the Programdata location to the Z drive. The Z could be a user mapped drive or any location you would prefer it go to. Keeping in mind that only the EXE(s) that you specify will only be redirected. Jul 08,  · ADVERTISEMENT. Start with a right-click on the New Database (1), then Create New and from the context menu that opens \”Application Fix\”. This opens a new window where a program name, developer name and executable can be selected. The next page lists the compatibility modes. Locate and select RunAsInvoker from the list and click the Test Run. Jan 27,  · Answers. From our search, the Microsoft Application Compatibility Toolkit (ACT) is a lifecycle management tool that assists in identifying and managing your overall application portfolio, reducing the cost and time involved in resolving application compatibility issues, and helping you quickly deploy Windows and Windows updates.


– ACT Microsoft Compatibility Toolkit – Microsoft Q&A

Feb 05,  · Example:”C:\\Programdata\\Application X”;”Z:\\ApplicationStore\\Application X” This will redirect the application call from the Programdata location to the Z drive. The Z could be a user mapped drive or any location you would prefer it go to. Keeping in mind that only the EXE(s) that you specify will only be redirected. Oct 04,  · In Microsoft’s App Assure service was launched to fulfill Microsoft’s promise of application compatibility: your apps will work on Windows 10, Microsoft Apps, Azure Virtual Desktop, Microsoft Edge, Windows 10 on ARM64 PCs, and Windows following deployment. App Assure engineers are available to help resolve any issues you might. Assessing hardware and application compatibility needs to be part of your planning for deploying Windows App compatibility is more streamlined with Windows Windows 10 compatibility. SUBSCRIBE RSS FEEDS. Need more help? Expand your skills Explore Training. Get new features first.

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