Knowing Microsoft, I'm pretty sure the picture is uploaded to their servers as soon as you take it and it returns the server image to other people, but probably keeps a local copy on your profile for you.
No... that's just part of your CON public key. It's the Certificate Owner ManufactureDate. Don't listen to mattyovers. Ever. Anyways, the Halo Wars saves are encrypted. To edit them, someone will have to figure out how to decrypt them.
I'm going to explain how this came to be. SM's class was leaked and someone managed to extract the files in the Mythic Map Pack and build it. The thing is though, the 360 specifically does not allow LIVE content files to work under CON (demos, arcade games, DLC), so all of this is pointless. That file is completely useless. ANYONE who says it works for them is full of complete ********.
No, actually it doesn't. Whoever told you that was lying. Like I said, Marketplace type content will not work converted, and you can ask anyone who knows what they're doing about that.