When using XP Mode (or any VM), the application actually runs on that virtual OS. To summarize, the traditional Compatibility tab just imitates certain aspects of an older OS, but the application still runs on Windows 7. You can run those applications in the 32-bit VM. A good use of this technique is if you've rolled out Windows 7 64-bit and you have application that won’t run on a 64-bit OS (maybe it has 16-bit code). The seamless application integration is still available (once you install the integration tools in the VM). You can use your own Windows Vista or XP image, or even a Windows 7 image, to run applications. Your third option is basically the same as your second-you install Windows Virtual PC. Using this technology, the application is actually running on a 32-bit XP OS installation, so any application that works with XP should work in the XP Mode VM. The seamless application integration feature then allows the programs running in the Windows XP virtual machine (VM) to be displayed on the main Windows 7 desktop-the average user doesn't know the application is actually running in a VM. All XP Mode does is install Windows Virtual PC along with a Microsoft-created Windows XP image, into which you can install applications. If the Compatibility tab doesn't work for an application, you can use XP Mode, which was introduced in Windows 7. Ultimately, however, an application with these settings is still running on Windows 7 and the architecture of the Windows 7 installation (i.e., 64-bit). You can make some applications work on Windows 7 through these shims, and if you can, it's generally the optimal solution. These configurations (lies) are known as shims. They can also hide or disable elements of the OS that could cause problems with the application. ![]() The settings in this tab "lie" to applications about the OS and service pack it's running on. First, there's the standard Compatibility tab for applications, which was available in previous OSs. There are two (potentially three) very different compatibility modes in Windows 7.
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