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Microsoft® Windows® Group Policy Guide by William R. Stanek, Derek Melber, Darren Mar-Elia, The Microsoft Group Policy Team

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Configuring Application Compatibility Settings

When 16-bit and MS-DOS programs run on Microsoft Windows XP or Windows Server 2003 systems, they run in a special compatibility mode. Windows creates a virtual machine that mimics the 386-enhanced mode used by Windows 3.1, and the application runs within this context. Like most Windows components, Application Compatibility can be configured through Group Policy. For example, to enhance security and improve system stability, you might want to prevent users from running MS-DOS and 16-bit applications altogether. You can enable the related policy at the domain level. However, if you want computers and users in the DevTest OU to be able to run MS-DOS and 16-bit applications for testing purposes, you can ...

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