Example session: Xonotic
Xonotic has its data stored in multiple zip files (with a .pk3 file suffix) in the subfolder "data". Considering a mount point "~/mnt" the game data can be mounted with
pakdirfs Xonotic/data ~/mnt
To umount use `fusermount'
fusermount -u ~/mnt
User specific data for this game is usually stored in "~/.xonotic/data". To overlay the user data over the game data add the user data path after the game data path:
pakdirfs Xonotic/data ~/.xonotic/data ~/mnt
To listen to all the sounds in the game try
find ~/mnt -iname '*.ogg' -print0 | xargs -0 mplayer
Instead of mplayer vlc can be used as well
find ~/mnt -iname '*.ogg' -print0 | xargs -0 vlc