I'm preserving Japheth's MS-DOS extender. It features 16bit, and 32bit capabilities with the ability to run 16bit OS/2 program, and 32bit Win32 code on Vanilla MS-DOS.
The goal of this project - to create a TinySCHEME binaries for some kind of platforms. Now there are binaries for DOS / DJGPP and MinGW / MSYS / Win32, working on x86 architecture.