It is possible to view the complete list of files the game is using. Press [Shift] + ~ during game play to display the console window. Type dir to list all of the loaded files. If you want to list files of one specific directory, (for example, "music"), type dir music. If you want to list the files ending with a specific extension (for example, all files ending with .BSP in the "maps" directory), use dir maps bsp.