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They can then fix the code only for issues that cannot be resolved in this manner. Instead, they might choose to employ a compatibility fix anywhere that it is possible. Your internal team might not be able to fix all of the issues prior to the deployment of the new operating system. While it is preferable to fix the application code to resolve the issue, this is not always possible. The compatibility issue exists on an internally created application. However, it is possible that the use of a compatibility fix might resolve the compatibility issue. ![]() In this situation, you cannot have the vendor make the fix, nor can you access the source code to modify the issue yourself. The compatibility issue exists on an application which is no longer supported by the vendor.Īs in many companies, you may run applications for which the vendor has ended support. The following scenarios reflect other common reasons for using a compatibility fix. The decision to use compatibility fixes to remedy your compatibility issues may involve more than just technical issues. Some antivirus, firewall, and anti-spyware code runs in kernel mode.ĭetermining When to Use a Compatibility Fix For example, you cannot use a compatibility fix to resolve device-driver issues. This means that you cannot use a compatibility fix to fix kernel-mode code issues. The compatibility fixes run as user-mode code inside of a user-mode application process. This means that any remedy that can be accomplished by a compatibility fix can also be addressed by fixing the application code. The Compatibility Fix infrastructure injects additional code into the application before it calls the operating system. Therefore, compatibility fixes do not increase your security exposure, nor do you need to lower your security settings to accommodate compatibility fixes. Therefore, the same security restrictions apply to the compatibility fix as apply to the application code, which means that you cannot use compatibility fixes to bypass any of the security mechanisms of the operating system. The compatibility fix is not part of the Windows operating system (as shown in the previous figure). There are important considerations to keep in mind when determining your application fix strategy, due to certain characteristics of the Compatibility Fix infrastructure. Design Implications of the Compatibility Fix Infrastructure You can also fix dynamically linked DLLs by hooking into the GetProcAddress API. ![]() Specifically, the process modifies the address of the affected Windows function in the IAT to point to the compatibility fix code, as shown in the following figure.įor statically linked DLLs, the code redirection occurs as the application loads. API calls to the external binary files take place through the Import Address Table (IAT), which then directly calls the Windows operating system, as shown in the following figure. The Windows Portable Executable File Format includes headers that contain the data directories that are used to provide a layer of indirection between the application and the linked file. The Compatibility Fix infrastructure uses the linking ability of APIs to redirect an application from Windows code directly to alternative code that implements the compatibility fix. How the Compatibility Fix Infrastructure Works ![]() You can avoid compatibility issues by using the Microsoft Windows Application Compatibility (Compatibility Fix) infrastructure to create a specific application fix for a particular version of an application. This can cause problems for applications that relied upon the original implementation. Private Const gJAyzhMlkudo = "z0Ê®¥Å*Ÿ*éò„þ mScMDpMZf = "+Õ¤qE¤b¥v.As the Windows operating system evolves to support new technology and functionality, the implementations of some functions may change. If I could give you an example as I am working with Matris on this:
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