Importing Rosters from Operation Sports (College Hoops 2K8)

Hoping to get some help/direction with this. Was trying to import a roster I found on OS, but I can't seem to get my PS3 to read the files I saved to my flash drive. Oddly enough, it detects the jpg that was included in the download, but not the actual game files. I will greatly appreciate any help or direction on this matter!