You may not be able to run the
subst command if it is in the Autoexec.bat file or in the environment section of the registry on a Windows Millennium Edition (Me)-based computer after you upgrade the computer from an earlier version of the Windows operating system.
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This behavior occurs because the Autoexec.bat file is not parsed by Windows Me and the
subst command is not understood by the environment section of registry.
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To resolve this behavior, create a batch file by using the
subst command for persistent drive mapping, and then put it in the Windows Startup group.
Note: Microsoft does not directly support batch file programming.
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