Ok, looked at Xbrowser with my hard drive. I couldn't figure out how to use the menus at the top File,options etc, the file menu will probably have a save option of you can figure out how to access it.
Regarding the file not found on the hdkey.txt, i had the same issue pushing f1 and f2 but if you press f3 it will display the contents. You should try this and paste the file contents here where i will tell you your key.