I just tried it and it worked, I wanted to use a converter, but no use, link not working for me
So here's the steps to get your File from Cache:
1) Open your UT folders
2) Open the Cache Folder
3) Now Search for the file named Cache
4) Open it, now you will see a big list of stuff that your PC download into this folder.
5) Click CTR+F to show the Find menu, Type the Name of the map you want (Note: Finding the music of the map is impossible unless you find the map)
6)After you found the map you want, Copy the first name (E.g: "34d8d0...etc= The thing Name)
and do the same thing in the FOLDER Cache , CTR+F and paste the name and get it
(Note: The music/texture of the map will be under it exactly)
7) Paste the file type in it correct place ( a map, in the map folder, music, etc....)
8 ) Rename the file into its original type (YOU MUST ENABLE THE "Show the file extention" IN THE FOLDER OPTION > VIEW TO DO THIS STEP!!!!)
9) Enjoy!
Note: Here's the list of UT's files
UXX = Cache File
UMX = Music File
UNR = Maps
UTX = Texture file
U = Important files, Just place them in the system
Now you don't need to use a converter to use ALL the stuff you got ^^
One last thing, So sorry for making it long ^^;