Hello!
The info on the site says is all:
  
https://www.japheth.de/HX.html
"HX DOS-Extender is a free DOS extender with built-in Win32 PE  
file format support. Usually the purpose of a DOS extender is to  
make protected-mode features available for DOS applications. HX  
fully supports this goal, but goes some steps further. A Win32  
API emulation layer is part of HX which allows many Win32 console   applications to run in DOS. This emulation goes far beyond  
similiar approaches in other extenders (Borland's PowerPack,  
WDOSX or Phar Lab TNT). Furthermore HX implements - limited -  
support for windows, DirectDraw, GDI and even OpenGL graphics.  
This allows to run "simple" Win32 GUI apps in DOS as well."
--- OpenXP 5.0.48
 * Origin: (} Pointy McPointFace (21:4/106.21)