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The following list describes common compatibility issues for Windows 7, particularly when using an application originally designed for Windows XP:
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User Account Control In Windows 7, by default, all interactive users, including members of the Administrators group, run as standard users . User Account Control (UAC) is the mechanism through which users can elevate applications to full administrator privileges . Because of UAC, applications that require administrator rights or check for administrator privileges behave differently in Windows 7, even when run by a user as administrator .
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CHapTER 5
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Windows Resource Protection Windows Resource Protection (WRP) is designed to protect the system in a read-only state to increase system stability, predictability, and reliability . This will affect specific files, folders, and registry keys . Updates to protected resources are restricted to the operating-system trusted installers (TrustedInstaller group), such as Windows Servicing . This helps to protect features and applications that ship with the operating system from any impact of other applications and administrators . This impact can be an issue for custom installations not detected as set up by Windows 7 when applications try to replace WRP files and registry settings and check for specific versions and values . Internet Explorer Protected Mode In Windows 7, Windows Internet Explorer 8 processes run in IEPM with greatly restricted privileges to help protect users from attack . Internet Explorer Protected Mode (IEPM) significantly reduces the ability of an attack to write, alter, or destroy data on the user s computer, or to install malicious code . This could affect ActiveX controls and other script code that try to modify higherintegrity-level objects . Operating system and Internet Explorer versioning Many applications check the version of the operating system and behave differently or fail to run when an unexpected version number is detected . You can resolve this issue by setting appropriate compatibility modes or applying versioning shims (application-compatibility fixes) . New folder locations User folders, My Documents folders, and folders with localization have changed since Windows XP . Applications with hard-coded paths may fail . You can mitigate this by using directory junctions or by replacing hard-coded paths with appropriate API calls to get folder locations . Session 0 isolation Running services and user applications together in Session 0 poses a security risk because these services run at an elevated privilege level and therefore are targets for malicious agents looking for a means to elevate their own privilege level . In earlier versions of the Windows operating system, services and applications run in the same session as the first user who logs on to the console (Session 0) . To help protect against malicious agents in Windows 7, Session 0 has been isolated from other sessions . This could impact services that communicate with applications using window messages .
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You can use five primary tools to mitigate application-compatibility issues: Program Compatibility Assistant, Program Compatibility Wizard, ACT, Windows XP Mode, and application virtualization . The following sections describe each tool and when it is appropriate to use each tool versus using other tools or technologies . The first two tools provide approaches for users and one-off support issues but are not for use in a large-scale deployment . The remainder of this chapter focuses on using the ACT to inventory, analyze, and mitigate compatibility issues, because this is the tool that organizations primarily use in large-scale deployment .
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The Microsoft assessment and planning (Map) Toolkit 4.0 is a free tool from
Microsoft that you can use to plan your Windows 7 migration project. It can help you assess your environment s readiness for Windows 7. For more information about Map, see http://technet.microsoft.com/en-us/solutionaccelerators/dd537566.aspx.
program Compatibility assistant
If you have an individual application that needs Windows 7 compatibility remediation, one mitigation tool that might be effective is the built-in Program Compatibility Assistant . To run the Program Compatibility Assistant, right-click the application s .exe file, click Properties, and then click the Compatibility tab to view the application s compatibility settings, as shown in Figure 5-1 . If the program is used by multiple users on the same computer, click Change Settings For All Users to change the settings selected here to affect all users .
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