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If your OpenGL version is too old (< 2.0) follow these steps to get it running in software rendering mode.
Get Mesa binary package from http://downloads.sourceforge.net/project/msys2/REPOS/MINGW/i686/mingw-w64-i686-mesa-10.0.2-1-any.pkg.tar.xz
Copy and paste opengl32.dll from the Mesa binary package into the OpenOMF directory.
Create a file called openomf.bat and paste the following:
set SDL_RENDER_DRIVER=opengl openomf.exe
Now run openomf.bat!