Very nice project to make many old games playable in windowed mode.
EFS support was added in v33, though you may find the attached config file not yet working correctly - YMMV.
It worked for author but not for me, though author quickly found the problem and after few iterations he made working config for me.
See project discussion (forums) to find working config files (and some technical info).
Or download version 34+ (when it will be available
).