when I put the files on the memory card side it says not a valid xbox save. I have know idea what I should do. Please help

Action replay sucks try an MS memory card .

Its not a valid save.Dont unpack the extract file. Drag drop it.Make sure you got the file from a good source.If your trying to use a halo 2 save with hex edit.And re sign the code. Dont even try it. For no halo 2 resign software will work.Cause the big deal with bungie and moding halo 2 onlin. Anyways you can talk about moding halo 2 here. But whatever.