i like cygnus, but there are plenty of free or shareware hex editors out there.. as for the list i found this awhile back i haven't confirmed it but my guess is that it's accurate.
Code:
ROM/26/37.dat -- West Ronfaure
ROM/26/38.dat -- East Ronfaure
ROM/26/39.dat -- La Theine Plateau
ROM/26/40.dat -- Valkurm Dunes
ROM/26/41.dat -- Jugner Forest
ROM/26/42.dat -- Batallia Downs
ROM/26/43.dat -- North Gustaberg
ROM/26/44.dat -- South Gustaberg
ROM/26/45.dat -- Konschtat Highlands
ROM/26/46.dat -- Pashhow Marshlands
ROM/26/47.dat -- Rolanberry Fields
ROM/26/48.dat -- Beaucedine Glacier
ROM/26/49.dat -- Xarcabard
ROM/26/52.dat -- West Sarutabaruta
ROM/26/53.dat -- East Sarutabaruta
ROM/26/54.dat -- Tahrongi Canyon
ROM/26/55.dat -- Buburimu Peninsula
ROM/26/56.dat -- Meriphataud Mountains
ROM/26/57.dat -- Sauromugue Champaign
ROM/26/63.dat -- Qufim Island
ROM/26/64.dat -- Behemoth's Dominion
ROM/26/76.dat -- Horlais Peak
ROM/26/77.dat -- Ghelsba Outpost
ROM/26/78.dat -- Fort Ghelsba
ROM/26/79.dat -- Yughott Grotto
ROM/26/80.dat -- Palborough Mines
ROM/26/81.dat -- Waughroon Shrine
ROM/26/82.dat -- Giddeus
ROM/26/83.dat -- Balga's Dais
ROM/26/84.dat -- Beadeaux
ROM/26/85.dat -- Qulun Dome
ROM/26/86.dat -- Davoi
ROM/26/87.dat -- Monastic Cavern
ROM/26/88.dat -- Castle Oztroja
ROM/26/89.dat -- Altar Room
ROM/26/94.dat -- Middle Delkfutt's Tower
ROM/26/95.dat -- Upper Delkfutt's Tower
ROM/26/98.dat -- Castle Zvahl Baileys
ROM/26/99.dat -- Castle Zvahl Keep
ROM/26/102.dat -- Throne Room
ROM/26/103.dat -- Ranguemont Pass
ROM/26/104.dat -- Bostaunieux Oubliette
ROM/26/106.dat -- Toraimarai Canal
ROM/26/109.dat -- Zeruhn Mines
ROM/26/121.dat -- Lower Delkfutt's Tower
ROM/26/127.dat -- King Ranperre's Tomb
ROM/27/0.dat -- Dangruf Wadi
ROM/27/1.dat -- Inner Horutoto Ruins
ROM/27/2.dat -- Ordelle's Caves
ROM/27/3.dat -- Outer Horutoto Ruins
ROM/27/4.dat -- The Eldieme Necropolis
ROM/27/5.dat -- Gusgen Mines
ROM/27/6.dat -- Crawlers' Nest
ROM/27/7.dat -- Maze of Shakhrami
ROM/27/9.dat -- Garlaige Citadel
ROM/27/13.dat -- Fei'Yin
ROM/27/15.dat -- Qu'Bia Arena
ROM/27/29.dat -- Ship bound for Selbina
ROM/27/30.dat -- Ship bound for Mhaura
ROM/27/32.dat -- San d'Oria-Jeuno Airship
ROM/27/33.dat -- Bastok-Jeuno Airship
ROM/27/34.dat -- Windurst-Jeuno Airship
ROM/27/36.dat -- Ship bound for Selbina
ROM/27/37.dat -- Ship bound for Mhaura
ROM/27/39.dat -- Southern San d'Oria
ROM/27/40.dat -- Northern San d'Oria
ROM/27/41.dat -- Port San d'Oria
ROM/27/42.dat -- Chateau d'Oraguille
ROM/27/43.dat -- Bastok Mines
ROM/27/44.dat -- Bastok Markets
ROM/27/45.dat -- Port Bastok
ROM/27/46.dat -- Metalworks
ROM/27/47.dat -- Windurst Waters
ROM/27/48.dat -- Windurst Walls
ROM/27/49.dat -- Port Windurst
ROM/27/50.dat -- Windurst Woods
ROM/27/51.dat -- Heavens Tower
ROM/27/52.dat -- Ru'Lude Gardens
ROM/27/53.dat -- Upper Jeuno
ROM/27/54.dat -- Lower Jeuno
ROM/27/55.dat -- Port Jeuno
ROM/27/57.dat -- Selbina
ROM/27/58.dat -- Mhaura
====== Rise of the Zilart Areas ======
ROM2/13/95.dat -- Cape Teriggan
ROM2/13/96.dat -- Eastern Altepa Desert
ROM2/13/97.dat -- The Sanctuary of Zi'Tah
ROM2/13/98.dat -- Ro'Maeve
ROM2/13/99.dat -- Yuhtunga Jungle
ROM2/13/100.dat -- Yhoator Jungle
ROM2/13/101.dat -- Western Altepa Desert
ROM2/13/102.dat -- Valley of Sorrows
ROM2/13/103.dat -- Ru'Aun Gardens
ROM2/13/104.dat -- Dynamis - Beaucedine
ROM2/13/105.dat -- Dynamis - Xarcabard
ROM2/13/106.dat -- The Boyahda Tree
ROM2/13/107.dat -- Dragon's Aery
ROM2/13/108.dat -- Temple of Uggalepih
ROM2/13/109.dat -- Den of Rancor
ROM2/13/110.dat -- Sacrificial Chamber
ROM2/13/111.dat -- Chamber of Oracles
ROM2/13/112.dat -- Full Moon Fountain
ROM2/13/113.dat -- Korroloka Tunnel
ROM2/13/114.dat -- Kuftal Tunnel
ROM2/13/115.dat -- Sea Serpent Grotto
ROM2/13/116.dat -- Ve'Lugannon Palace
ROM2/13/117.dat -- The Shrine of Ru'Avitau
ROM2/13/118.dat -- Stellar Fulcrum
ROM2/13/119.dat -- La'Loff Amphitheater
ROM2/13/120.dat -- The Celestial Nexus
ROM2/13/121.dat -- Dynamis - San d'Oria
ROM2/13/122.dat -- Dynamis - Bastok
ROM2/13/123.dat -- Dynamis - Windurst
ROM2/13/124.dat -- Dynamis - Jeuno
ROM2/13/125.dat -- Cloister of Gales
ROM2/13/126.dat -- Cloister of Storms
ROM2/13/127.dat -- Cloister of Frost
ROM2/14/0.dat -- Ifrit's Cauldron
ROM2/14/1.dat -- Cloister of Flames
ROM2/14/2.dat -- Quicksand Caves
ROM2/14/3.dat -- Cloister of Tremors
ROM2/14/4.dat -- Cloister of Tides
ROM2/14/5.dat -- Gustav Tunnel
ROM2/14/6.dat -- Labyrinth of Onzozo
ROM2/14/7.dat -- Kazham-Jeuno Airship
ROM2/14/8.dat -- Rabao
ROM2/14/9.dat -- Kazham
ROM2/14/10.dat -- Hall of the Gods
ROM2/14/11.dat -- Norg
====== Chain of Promathia Areas ======
ROM3/2/111.dat -- Phanauet Channel
ROM3/2/112.dat -- Carpenters' Landing
ROM3/2/113.dat -- Manaclipper
ROM3/2/114.dat -- Bibiki Bay
ROM3/2/115.dat -- Uleguerand Range
ROM3/2/116.dat -- Bearclaw Pinnacle
ROM3/2/117.dat -- Attohwa Chasm
ROM3/2/118.dat -- Boneyard Gully
ROM3/2/119.dat -- Pso'Xja
ROM3/2/120.dat -- The Shrouded Maw
ROM3/2/121.dat -- Oldton Movalpolos
ROM3/2/122.dat -- Newton Movalpolos
ROM3/2/123.dat -- Mine Shaft #2716
ROM3/2/124.dat -- Hall of Transference
ROM3/2/126.dat -- Promyvion-Holla
ROM3/2/127.dat -- Spire of Holla
ROM3/3/0.dat -- Promyvion-Dem
ROM3/3/1.dat -- Spire of Dem
ROM3/3/2.dat -- Promyvion-Mea
ROM3/3/3.dat -- Spire of Mea
ROM3/3/4.dat -- Promyvion-Vahzl
ROM3/3/5.dat -- Spire of Vahzl
ROM3/3/6.dat -- Lufiase Meadows
ROM3/3/7.dat -- Misareaux Coast
ROM3/3/8.dat -- Tavnazian Safehold
ROM3/3/9.dat -- Phomiuna Aqueducts
ROM3/3/10.dat -- Sacrarium
ROM3/3/11.dat -- Riverne - Site #B01
ROM3/3/12.dat -- Riverne - Site #A01
ROM3/3/13.dat -- Monarch Linn
ROM3/3/14.dat -- Sealion's Den
ROM3/3/15.dat -- Al'Taieu
ROM3/3/16.dat -- Grand Palace of Hu'Xzoi
ROM3/3/17.dat -- The Garden of Ru'Hmet
ROM3/3/18.dat -- Empyreal Paradox
ROM3/3/19.dat -- Temenos
ROM3/3/20.dat -- Apollyon
ROM3/3/21.dat -- Dynamis - Valkurm
ROM3/3/22.dat -- Dynamis - Buburimu
ROM3/3/23.dat -- Dynamis - Qufim
ROM3/3/24.dat -- Dynamis - Tavnazia
ROM3/3/25.dat -- Diorama Abdhaljs-Ghelsba
ROM3/3/26.dat -- Abdhaljs Isle-Purgonorgo
====== Treasure of Aht Urgan ======
ROM4/1/45.dat -- Open sea route to Al Zahbi
ROM4/1/46.dat -- Open sea route to Mhaura
ROM4/1/47.dat -- Al Zahbi
ROM4/1/49.dat -- Aht Urhgan Whitegate
ROM4/1/50.dat -- Wajaom Woodlands
ROM4/1/51.dat -- Bhaflau Thickets
ROM4/1/52.dat -- Nashmau
ROM4/1/53.dat -- Arrapago Reef
ROM4/1/54.dat -- Ilrusi Atoll
ROM4/1/55.dat -- Periqia
ROM4/1/56.dat -- Talacca Cove
ROM4/1/57.dat -- Silver Sea route to Nashmau
ROM4/1/58.dat -- Silver Sea route to Al Zahbi
ROM4/1/59.dat -- The Ashu Talif
ROM4/1/60.dat -- Mount Zhayolm
ROM4/1/61.dat -- Halvung
ROM4/1/62.dat -- Lebros Cavern
ROM4/1/63.dat -- Navukgo Execution Chamber
ROM4/1/64.dat -- Mamook
ROM4/1/65.dat -- Mamool Ja Training Grounds
ROM4/1/66.dat -- Jade Sepulcher
ROM4/1/67.dat -- Aydeewa Subterrane
ROM4/1/68.dat -- Leujaoam Sanctum
ROM4/1/69.dat -- Chocobo Circuit
ROM4/1/70.dat -- The Colosseum
ROM4/1/71.dat -- Alzadaal Undersea Ruins
ROM4/1/72.dat -- Zhayolm Remnants
ROM4/1/73.dat -- Arrapago Remnants
ROM4/1/74.dat -- Bhaflau Remnants
ROM4/1/75.dat -- Silver Sea Remnants
ROM4/1/76.dat -- Nyzul Isle
ROM4/1/77.dat -- Hazhalm Testing Grounds
ROM4/1/78.dat -- Caedarva Mire