For whatever reason you need an original Xbox live account,
for a game or research. these are free to get, from a few xboxes I bought over the years.
NOTE: These where stored inside the first part, not as a file. on the HDD they also are "inside" the config sector
or something. SO THEY ARE NOT FILES, i made the extension up, you CANT just put them on a xbox using a explorer.
a quick tutorial on how to get these to work, Assemblergames.com
The first part of a MU with a live account to see how it fits in