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Another change in Vista relating to application compatibility is the use of file system and registry virtualization. Legacy apps often fail to run properly because they try to write to protected areas of the file system (such as %ProgramFiles%) or restricted portions of the registry (such as the SOFTWARE hive). Normally, you need administrator credentials to write to these areas, so administrators often must make domain users members of the local Administrators group on their desktop computers for third-party applications to install and run properly. Vista sidesteps this issue by enabling applications under certain conditions to write to corresponding per-user virtual areas of the file system and registry. In other words, file system and registry virtualization is designed to avoid some of the problems that arise when non-admins try to install and run applications on their computers. According to Microsoft, however, future versions of Windows might not support file system and registry virtualization, which means that you shouldn't depend on it as the only means of making your legacy apps run.

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