The shimmed functions then implement the behaviour of previous Windows versions. GetVersionEx is an easy sample, each Windows version returns its own version numbers in GetVersionEx, so when faking an old Windows the GetVersionEx function now not returns the Windows 7 version numbers but for example the Windows XP version numbers. So the application will believe it is running on Windows XP. There have also been some other changes from Windows version to Windows version. In older versions for example, if a program loaded a DLL, the search path for the DLL also included the current directory. This is a security issue, so newer versions of Windows by default don't search in the current directory. With the proper shim you can simulate the old behaviour. Since shims are just a layer between the application and the Windows API a shim can just do what the application could do itself. This tool gives you an overview over the applications with known issues, all available compatibility fixes and modes and which fixes are applied to each application.First, try running the compatibility troubleshooter: Creating an Application Compatibility Shim with the Microsoft Application Compatibility ToolkitĮspecially Microsoft Application Compatibility Toolkit is worth a look.Using the CorrectFilePaths Shim to Redirect Files on Windows Vista.If you want to know more, here are some links you might find interesting: The shim cannot be used for example to circumvent UAC or access protected files. In the search box on the taskbar, type the name of the program or app you want to troubleshoot. Select and hold (or right-click) it, and then select Open file location. Select and hold (or right-click) the program file, select Properties, and then select the Compatibility tab. If that didn’t work, you can try adjusting the settings Compatibility tab. Run this program in compatibility mode for Here's what to look for and what each setting does when it's selected. Runs the program using settings from an earlier version of Windows. Try this setting if you know the program is designed for (or worked with) a specific version of Windows. Uses a limited set of colors in the program. Some older programs are designed to use fewer colors. If your program isn't displayed correctly on a PC with a high-DPI display (its features are blurry or are too big or too small), select Change high DPI settings, and then try one of these options in the Properties dialog box: Try this setting if the graphics for the program appear jagged or are rendered incorrectly. In the Program DPI section, select Use this setting to fix scaling problems for this program instead of the one in Settings to use the DPI settings you want to use for this program. Note: This changes the DPI only for the app you're adjusting.
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