unreal tournament 2004 maps

[Thermaltke]

i noticed that the names of the maps you download while logigng onto servers on multiplayer unreal tournament are located in C:\UT2004\Cache\Cache, some maps you play are awesome, but is there any way of you being able to use them in single player, or convert them in some way?? and no they are not already there in single player menus.

thankyou
harry