Hm, I don't have an XBox360 but it reminds me a bit of the old XBox files. I played around with files on the old XBox in the past and extracted files and generated my own version of CoD with custom skins. The old XBox files were a kind of an archive, all files were put behind each other in an endless row. At the beginnig of the file you could find the directory/content/names of the files included. The files you posted look similar. You need to know the files you're looking for. On XBox1 it was simple because it used DDS files for skins and images. It was easy to find the file header for those files. In your case the XBox 360 will probably use XNA (
http://en.wikipedia.org/wiki/Microsoft_XNA) for files. If you're looking for soundfiles you need at least to know the file header for XNA soundfiles. Then you can search for them in the MAP-Archive. If you don't know the header, you need to examinate the MAP archive a bit more and to see if you find a directory with the position and length of the different files inside the archive. I don't remember well but I guess the directory inside XBox1 files included only the length of the stored files and not the position to start with but I may be wrong here. A lot of time passed as I worked with the files.
If you look for such length-data, keep in mind that most programs and games write such informations in a "reverse way". I guess the correct word for it is little endian. For example, if you find the HEX-values 00 00 1A 25 you may need to read them from the right side to the left side: 25 1A 00 00.
Sorry for my bad english, I am German and also I am not a programmer so I may cause some confusion with my words. You need to read it sensitive. :)
