![]() Executable files may, in some cases, harm your computer. exe extension on a filename indicates an executable file. NTVDM stands for Windows NT Virtual DOS Machine NTVDM is essential for some businesses, for example, which still consider DOS or Win16 accounting software extremely reliable and have databases with decades of transaction history. Developers can make apps use separate VDMs but not if they need shared memory to communicate. ![]() By default all 16-bit DOS or Win16 apps are threads in one NTVDM process and all threads crash if one does, but not Windows. (64-bit Windows systems use internal "handles" having too many significant bits to be truncated for its use.) In Windows 8 and above it is present but compressed and disabled by default it installs (which requires elevated privileges) when first used. It provides the "NT Virtual DOS Machine" (VDM) subsystem on 32-bit Windows machines to run DOS and 16-bit Windows applications. It is an essential Windows process and should not be removed. Microsoft created the "NTVDM.exe" process when it advanced from 16-bit software in DOS and Windows 3.x to the Windows NT 32-bit environment. The genuine ntvdm.exe file is a software component of Microsoft Windows Operating System by Microsoft Corporation.
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