Data is correct, _r.u.s.s. After googling for some time, I learned that it is for DOS executables only, hence why those tabs are not visible for Entomorph, which is a Windows game.
@ dosraider: thanks for the link
EDIT: Any other possible solutions to play this game on Win XP before I get down and dirty with the DOSBox and Win 31 route which may take some time?