Computer/User Node :
MACHINE
Policy Path :
Administrative
Templates\Windows Components\Application Compatibility
Supported on :
At least Microsoft Windows Server 2003
Help/Explain Text :
Specifies
whether to prevent the MS-DOS subsystem (ntvdm.exe) from running on this
computer. This setting affects the launching of 16-bit applications in the
operating system. By default, the MS-DOS subsystem runs for all users on this
computer. You can use this setting to turn off the MS-DOS subsystem, which will
reduce resource usage and prevent users from running 16-bit applications. To
run any 16-bit application or any application with 16-bit components, ntvdm.exe
must be allowed to run. The MS-DOS subsystem starts when the first 16-bit
application is launched. While the MS-DOS subsystem is running, any subsequent
16-bit applications launch faster, but overall resource usage on the system is
increased. If the status is set to Enabled, ntvdm.exe is prevented from
running, which then prevents any 16-bit applications from running. In addition,
any 32-bit applications with 16-bit installers or other 16-bit components
cannot run. If the status is set to Disabled, the default setting applies and
the MS-DOS subsystem runs for all users on this computer. If the status is set
to Not Configured, the default applies and ntvdm.exe runs for all users.
However, if an administrator sets the registry DWORD value
HKLM\System\CurrentControlSet\Control\WOW\DisallowedPolicyDefault to 1, the
default changes to prevent all 16-bit applications from running. Note: This
setting appears in both Computer Configuration and User Configuration. If both
settings are configured, the Computer Configuration setting overrides.
Registry Settings :
HKLM\Software\Policies\Microsoft\Windows\AppCompat!VDMDisallowed
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