Ntvdm.exe is a system process.
When you start a 16-bit program on a computer running Windows
NT, the Ntvdm.exe and Wowexec.exe processes start. After you quit the 16-bit program, the Ntvdm.exe and Wowexec.exe processes remain in memory. This behavior is a design feature of Windows NT. The Ntvdm.exe and Wowexec.exe processes remain in memory in case you start another 16-bit program. Leaving the Windows-On-Windows (WOW) environment (which consists of the Ntvdm.exe and Wowexec.exe processes) in memory improves performance. The WOW environment is not loaded when you start Windows NT. It is loaded when you first start a 16-bit program. File ntvdm.exe is related to
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