W31System.ttf is the 16px bitmap strike of Wine's "System" font
(fonts/system.sfd, Copyright (C) 2004 Huw D M Davies, Dmitry Timoshkov),
converted to an outline font with tools/sfd2bdf.mjs and tools/bdf2ttf.mjs.

It is distributed under the GNU Lesser General Public License, version 2.1
(https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html).
Source: https://gitlab.winehq.org/wine/wine/-/blob/master/fonts/system.sfd