using find to list files

list all files that have a specific extension:
find /lib/modules/3.3.8-desktop-2.mga2/kernel/drivers/media -name '*.ko.xz' -exec ls -la {} \;

remove all files that have a specific extension:
find /lib/modules/3.3.8-desktop-2.mga2/kernel/drivers/media -name '*.ko.xz' -exec rm -rf {} \;