Dead Rising 2:Skill Packs

Im sorry if there is already a thread up about this but i downloaded all the four skill packs off marketplace. I was just wondering what they do and how do you get them to work. Thanks

I'm pretty sure the skill packs allow you to start the game with free weapons, costumes, and bonuses to your skills.

So whereabouts are the weapons/costumes? ive downloaded them all and none of them are in the saferoom bathroom where you usually get all of your clothing.

If you downloaded them through xbox live without any codes then you downloaded the compatibility packs. Basically those ones give you the ability to do co-op with other individuals who actually have those packs. They are required to play with the other person if they have Xpack you must download Xpack compatibility.