We recommend that NTVDM is turned off in all enterprise environments. ![]() Microsoft does have Device Guard and other Windows features that can mitigate the security risks. The technology underlying NTVDM is no longer actively under development and use of this technology may pose security risks. It is not supported on 圆4 and ARM versions of Windows, which do not support 16-bit x86 code of any kind, including DOS programs. NTVDM is a Feature on Demand and only supported on the x86 version of Windows. We encourage our customers to build new apps that don’t rely on this component. Therefore, our recommendation is that customers do not use NTVDM. However, in modern operating systems, it's in maintenance mode and is no longer being developed. Many enterprise customers are still running 16-bit Windows applications and depending on this feature. Given that it's older technology introduced more than 20 years ago, the Microsoft Windows team can provide only limited support for NTVDM. The Windows NT 32-bit user-mode executable that is the basis for a single DOS (or Windows 3.x) environment is called ntvdm.exe. ![]() This component allows the execution of 16-bit Windows applications on 32-bit Windows operating systems, as well as the execution of both 16-bit and 32-bit DOS applications. ![]() ![]() NTVDM, or the NT Virtual DOS Machine, is a system component introduced in 1993 for all IA-32 editions of the Windows NT family (not included with 64-bit versions of the OS).
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