[pjmlp]

Proton is like the OS/2's Win32 compatibility, it did wonders for OS/2 adoption.

[Fnoord]

Or it is like Windows' MSDOS compatibility.

[pjmlp]

Except that 16 bit Windows was a MS-DOS extender, from the same OS vendor.

Ah, Windows gaming only took off after WinG got introduced, until then games were mostly targeting MS-DOS.