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Windows on Windows (WOW) — system component, which provide running apps, which using legacy 16-bit version of Windows API (Win 16) in 32-bit versions Windows NT.

WOW implemented with help NTVDM and win16api stubs. NTVDM used for running 16-bit code, and win16api stubs thunks legacy 16-bit APIs to their newer 32-bit equivalents.

Usual, WOW used for old 16-bit installers.

29-03-2018 Aleksandar Andrejevic (NTVDM developer) announced what he plans to work on WOW.

Why 16-bit apps work in the Wine?

In the Wine work of 16-bit apps depends on kernel module ldt16, whereby emulate 16-bit code.[1]