hmmmm, never saw that one before but i'll take a guess that it's using some server sides includes that need web support before it will work properly. After you added it, did you preview in browser and it not work?
I won't give you the snappy answer that scroll gave but i'm a heavy Dreamweaver user myself but started out with Frontpage first so it's been a long time since i've done any heavy work in it. There used to be a couple of Frontpage users here but i don't know where they went to.