This is the simpliest way to delete it manually
go to C:\Program Files\GameClub\Philippines\SpecialForce\data\area
tick Tools, Folder Options , View , tick Show Hidden Files and Folders
uncheck Hide Protected Operating System Files [warning will prompt , just tick yes and apply]
then
area_028.sff and
area_029.sff will appear then delete it
your map is restored to normal....