How Ghostscript is helping Corel Draw?

Why would I need Ghost script installed? Many people say it resolves some problems with post script in Corel Draw. Is this true?

Also why I can't even see EPS extension file format on the list when I try to import something? Is it again because I need to install something extra? (it's a new machine)

Also it's a shame that saving optimised PDF from Adobe Acrobat and ticking 'Make compatible with Illustrator 8+' is not helping with PDF import (CS5 file not outlined shows messed letters in Corel x5, most probably because of some new letter space effect in Illustrator CS5).