Wowexec.com

Wowexec.exe (Windows on Windows subsystem) and Ntvdm.exe (NT Virtual DOS
Machine) are used to run 16-bit programs (DOS programs) in a virtual
environment. If they are being used you will see the programs indented
under the Ntvdm.exe entry in the Task Manager. Ntvdm.exe and
Wowexec.exe will remain in memory after you close the 16-bit
application, "in case" you want to launch another 16-bit program. If
these items are started when you boot the computer, but no associated
program is shown under them, check your startup items, some 16-bit
program is set to start and do something when the computer starts. That
"16-bit something" could be anything.