Ive just readed the post that you needen HL1! :\ Which i dident knew bhut ok.
I do have an buyed version of Half Life: Blueshift wich i have a long time bhut is ESF compitable with this game also or do i really need to bey HL1
Well, I think that if it doesn't work, it should be because it's like Opposing Force more than anything else. But it looks like noone has checked this issue recently, so we'll have to wait and see.
Btw, you should add the result to one of the stickies or something imo.