Array
mp_array
Cracked
mp_cracked
Crisis
mp_crisis
Firing Range
mp_firingrange
Grid
mp_duga
Hanoi
mp_hanoi
Havana
mp_cario
Jungle
mp_havoc
Launch
mp_cosmodrome
Nuketown
mp_nuked
Radiation
mp_radiation
Summit
mp_mountain
Villa
mp_villa
WMD
mp_russianbase
Berlin Wall
mp_berlinwall2
Discovery
mp_discovery
Kowloon
mp_kowloon
Stadium
mp_stadium
Convoy
mp_gridlock
Hotel
mp_hotel
Stockpile
mp_outskirts
Zoo
mp_zoo
Drive-In
mp_drivein
Hangar 18
mp_area51
Hazard
mp_golfcourse
Silo
mp_silo
You can download a plain text version of the map file name listing here.