To the person that asked about a list of all DAT files with their corresponding areas, here's an XML file which I don't feel like editing out all the XML, but it should be pretty obvious how to make sense of it even if you don't know what XML is:
Code:
<?xml version="1.0" encoding="utf-8" ?>
<roms>
<rom location="ROM\26\37.dat" area="West Ronfaure"/>
<rom location="ROM\26\38.dat" area="East Ronfaure"/>
<rom location="ROM\26\39.dat" area="La Theine Plateau"/>
<rom location="ROM\26\40.dat" area="Valkurm Dunes"/>
<rom location="ROM\26\41.dat" area="Jugner Forest"/>
<rom location="ROM\26\42.dat" area="Batallia Downs"/>
<rom location="ROM\26\43.dat" area="North Gustaberg"/>
<rom location="ROM\26\44.dat" area="South Gustaberg"/>
<rom location="ROM\26\45.dat" area="Konschtat Highlands"/>
<rom location="ROM\26\46.dat" area="Pashhow Marshlands"/>
<rom location="ROM\26\47.dat" area="Rolanberry Fields"/>
<rom location="ROM\26\48.dat" area="Beaucedine Glacier"/>
<rom location="ROM\26\49.dat" area="Xarcabard"/>
<rom location="ROM\26\52.dat" area="West Sarutabaruta"/>
<rom location="ROM\26\53.dat" area="East Sarutabaruta"/>
<rom location="ROM\26\54.dat" area="Tahrongi Canyon"/>
<rom location="ROM\26\55.dat" area="Buburimu Peninsula"/>
<rom location="ROM\26\56.dat" area="Meriphataud Mountains"/>
<rom location="ROM\26\57.dat" area="Sauromugue Champaign"/>
<rom location="ROM\26\63.dat" area="Qufim Island"/>
<rom location="ROM\26\64.dat" area="Behemoth's Dominion"/>
<rom location="ROM\26\76.dat" area="Horlais Peak"/>
<rom location="ROM\26\77.dat" area="Ghelsba Outpost"/>
<rom location="ROM\26\78.dat" area="Fort Ghelsba"/>
<rom location="ROM\26\79.dat" area="Yughott Grotto"/>
<rom location="ROM\26\80.dat" area="Palborough Mines"/>
<rom location="ROM\26\81.dat" area="Waughroon Shrine"/>
<rom location="ROM\26\82.dat" area="Giddeus"/>
<rom location="ROM\26\83.dat" area="Balga's Dais"/>
<rom location="ROM\26\84.dat" area="Beadeaux"/>
<rom location="ROM\26\85.dat" area="Qulun Dome"/>
<rom location="ROM\26\86.dat" area="Davoi"/>
<rom location="ROM\26\87.dat" area="Monastic Cavern"/>
<rom location="ROM\26\88.dat" area="Castle Oztroja"/>
<rom location="ROM\26\89.dat" area="Altar Room"/>
<rom location="ROM\26\94.dat" area="Middle Delkfutt's Tower"/>
<rom location="ROM\26\95.dat" area="Upper Delkfutt's Tower"/>
<rom location="ROM\26\98.dat" area="Castle Zvahl Baileys"/>
<rom location="ROM\26\99.dat" area="Castle Zvahl Keep"/>
<rom location="ROM\26\102.dat" area="Throne Room"/>
<rom location="ROM\26\103.dat" area="Ranguemont Pass"/>
<rom location="ROM\26\104.dat" area="Bostaunieux Oubliette"/>
<rom location="ROM\26\106.dat" area="Toraimarai Canal"/>
<rom location="ROM\26\109.dat" area="Zeruhn Mines"/>
<rom location="ROM\26\121.dat" area="Lower Delkfutt's Tower"/>
<rom location="ROM\26\127.dat" area="King Ranperre's Tomb"/>
<rom location="ROM\27\0.dat" area="Dangruf Wadi"/>
<rom location="ROM\27\1.dat" area="Inner Horutoto Ruins"/>
<rom location="ROM\27\2.dat" area="Ordelle's Caves"/>
<rom location="ROM\27\3.dat" area="Outer Horutoto Ruins"/>
<rom location="ROM\27\4.dat" area="The Eldieme Necropolis"/>
<rom location="ROM\27\5.dat" area="Gusgen Mines"/>
<rom location="ROM\27\6.dat" area="Crawlers' Nest"/>
<rom location="ROM\27\7.dat" area="Maze of Shakhrami"/>
<rom location="ROM\27\9.dat" area="Garlaige Citadel"/>
<rom location="ROM\27\13.dat" area="Fei'Yin"/>
<rom location="ROM\27\15.dat" area="Qu'Bia Arena"/>
<rom location="ROM\27\29.dat" area="Ship bound for Selbina"/>
<rom location="ROM\27\30.dat" area="Ship bound for Mhaura"/>
<rom location="ROM\27\32.dat" area="San d'Oria-Jeuno Airship"/>
<rom location="ROM\27\33.dat" area="Bastok-Jeuno Airship"/>
<rom location="ROM\27\34.dat" area="Windurst-Jeuno Airship"/>
<rom location="ROM\27\36.dat" area="Ship bound for Selbina"/>
<rom location="ROM\27\37.dat" area="Ship bound for Mhaura"/>
<rom location="ROM\27\39.dat" area="Southern San d'Oria"/>
<rom location="ROM\27\40.dat" area="Northern San d'Oria"/>
<rom location="ROM\27\41.dat" area="Port San d'Oria"/>
<rom location="ROM\27\42.dat" area="Chateau d'Oraguille"/>
<rom location="ROM\27\43.dat" area="Bastok Mines"/>
<rom location="ROM\27\44.dat" area="Bastok Markets"/>
<rom location="ROM\27\45.dat" area="Port Bastok"/>
<rom location="ROM\27\46.dat" area="Metalworks"/>
<rom location="ROM\27\47.dat" area="Windurst Waters"/>
<rom location="ROM\27\48.dat" area="Windurst Walls"/>
<rom location="ROM\27\49.dat" area="Port Windurst"/>
<rom location="ROM\27\50.dat" area="Windurst Woods"/>
<rom location="ROM\27\51.dat" area="Heavens Tower"/>
<rom location="ROM\27\52.dat" area="Ru'Lude Gardens"/>
<rom location="ROM\27\53.dat" area="Upper Jeuno"/>
<rom location="ROM\27\54.dat" area="Lower Jeuno"/>
<rom location="ROM\27\55.dat" area="Port Jeuno"/>
<rom location="ROM\27\57.dat" area="Selbina"/>
<rom location="ROM\27\58.dat" area="Mhaura"/>
<rom location="ROM2\13\95.dat" area="Cape Teriggan"/>
<rom location="ROM2\13\96.dat" area="Eastern Altepa Desert"/>
<rom location="ROM2\13\97.dat" area="The Sanctuary of Zi'Tah"/>
<rom location="ROM2\13\98.dat" area="Ro'Maeve"/>
<rom location="ROM2\13\99.dat" area="Yuhtunga Jungle"/>
<rom location="ROM2\13\100.dat" area="Yhoator Jungle"/>
<rom location="ROM2\13\101.dat" area="Western Altepa Desert"/>
<rom location="ROM2\13\102.dat" area="Valley of Sorrows"/>
<rom location="ROM2\13\103.dat" area="Ru'Aun Gardens"/>
<rom location="ROM2\13\104.dat" area="Dynamis - Beaucedine"/>
<rom location="ROM2\13\105.dat" area="Dynamis - Xarcabard"/>
<rom location="ROM2\13\106.dat" area="The Boyahda Tree"/>
<rom location="ROM2\13\107.dat" area="Dragon's Aery"/>
<rom location="ROM2\13\108.dat" area="Temple of Uggalepih"/>
<rom location="ROM2\13\109.dat" area="Den of Rancor"/>
<rom location="ROM2\13\110.dat" area="Sacrificial Chamber"/>
<rom location="ROM2\13\111.dat" area="Chamber of Oracles"/>
<rom location="ROM2\13\112.dat" area="Full Moon Fountain"/>
<rom location="ROM2\13\113.dat" area="Korroloka Tunnel"/>
<rom location="ROM2\13\114.dat" area="Kuftal Tunnel"/>
<rom location="ROM2\13\115.dat" area="Sea Serpent Grotto"/>
<rom location="ROM2\13\116.dat" area="Ve'Lugannon Palace"/>
<rom location="ROM2\13\117.dat" area="The Shrine of Ru'Avitau"/>
<rom location="ROM2\13\118.dat" area="Stellar Fulcrum"/>
<rom location="ROM2\13\119.dat" area="La'Loff Amphitheater"/>
<rom location="ROM2\13\120.dat" area="The Celestial Nexus"/>
<rom location="ROM2\13\121.dat" area="Dynamis - San d'Oria"/>
<rom location="ROM2\13\122.dat" area="Dynamis - Bastok"/>
<rom location="ROM2\13\123.dat" area="Dynamis - Windurst"/>
<rom location="ROM2\13\124.dat" area="Dynamis - Jeuno"/>
<rom location="ROM2\13\125.dat" area="Cloister of Gales"/>
<rom location="ROM2\13\126.dat" area="Cloister of Storms"/>
<rom location="ROM2\13\127.dat" area="Cloister of Frost"/>
<rom location="ROM2\14\0.dat" area="Ifrit's Cauldron"/>
<rom location="ROM2\14\1.dat" area="Cloister of Flames"/>
<rom location="ROM2\14\2.dat" area="Quicksand Caves"/>
<rom location="ROM2\14\3.dat" area="Cloister of Tremors"/>
<rom location="ROM2\14\4.dat" area="Cloister of Tides"/>
<rom location="ROM2\14\5.dat" area="Gustav Tunnel"/>
<rom location="ROM2\14\6.dat" area="Labyrinth of Onzozo"/>
<rom location="ROM2\14\7.dat" area="Kazham-Jeuno Airship"/>
<rom location="ROM2\14\8.dat" area="Rabao"/>
<rom location="ROM2\14\9.dat" area="Kazham"/>
<rom location="ROM2\14\10.dat" area="Hall of the Gods"/>
<rom location="ROM2\14\11.dat" area="Norg"/>
<rom location="ROM3\2\111.dat" area="Phanauet Channel"/>
<rom location="ROM3\2\112.dat" area="Carpenters' Landing"/>
<rom location="ROM3\2\113.dat" area="Manaclipper"/>
<rom location="ROM3\2\114.dat" area="Bibiki Bay"/>
<rom location="ROM3\2\115.dat" area="Uleguerand Range"/>
<rom location="ROM3\2\116.dat" area="Bearclaw Pinnacle"/>
<rom location="ROM3\2\117.dat" area="Attohwa Chasm"/>
<rom location="ROM3\2\118.dat" area="Boneyard Gully"/>
<rom location="ROM3\2\119.dat" area="Pso'Xja"/>
<rom location="ROM3\2\120.dat" area="The Shrouded Maw"/>
<rom location="ROM3\2\121.dat" area="Oldton Movalpolos"/>
<rom location="ROM3\2\122.dat" area="Newton Movalpolos"/>
<rom location="ROM3\2\123.dat" area="Mine Shaft #2716"/>
<rom location="ROM3\2\124.dat" area="Hall of Transference"/>
<rom location="ROM3\2\126.dat" area="Promyvion-Holla"/>
<rom location="ROM3\2\127.dat" area="Spire of Holla"/>
<rom location="ROM3\3\0.dat" area="Promyvion-Dem"/>
<rom location="ROM3\3\1.dat" area="Spire of Dem"/>
<rom location="ROM3\3\2.dat" area="Promyvion-Mea"/>
<rom location="ROM3\3\3.dat" area="Spire of Mea"/>
<rom location="ROM3\3\4.dat" area="Promyvion-Vahzl"/>
<rom location="ROM3\3\5.dat" area="Spire of Vahzl"/>
<rom location="ROM3\3\6.dat" area="Lufiase Meadows"/>
<rom location="ROM3\3\7.dat" area="Misareaux Coast"/>
<rom location="ROM3\3\8.dat" area="Tavnazian Safehold"/>
<rom location="ROM3\3\9.dat" area="Phomiuna Aqueducts"/>
<rom location="ROM3\3\10.dat" area="Sacrarium"/>
<rom location="ROM3\3\11.dat" area="Riverne - Site #B01"/>
<rom location="ROM3\3\12.dat" area="Riverne - Site #A01"/>
<rom location="ROM3\3\13.dat" area="Monarch Linn"/>
<rom location="ROM3\3\14.dat" area="Sealion's Den"/>
<rom location="ROM3\3\15.dat" area="Al'Taieu"/>
<rom location="ROM3\3\16.dat" area="Grand Palace of Hu'Xzoi"/>
<rom location="ROM3\3\17.dat" area="The Garden of Ru'Hmet"/>
<rom location="ROM3\3\18.dat" area="Empyreal Paradox"/>
<rom location="ROM3\3\19.dat" area="Temenos"/>
<rom location="ROM3\3\20.dat" area="Apollyon"/>
<rom location="ROM3\3\21.dat" area="Dynamis - Valkurm"/>
<rom location="ROM3\3\22.dat" area="Dynamis - Buburimu"/>
<rom location="ROM3\3\23.dat" area="Dynamis - Qufim"/>
<rom location="ROM3\3\24.dat" area="Dynamis - Tavnazia"/>
<rom location="ROM3\3\25.dat" area="Diorama Abdhaljs-Ghelsba"/>
<rom location="ROM3\3\26.dat" area="Abdhaljs Isle-Purgonorgo"/>
<rom location="ROM4\1\45.dat" area="Open sea route to Al Zahbi"/>
<rom location="ROM4\1\46.dat" area="Open sea route to Mhaura"/>
<rom location="ROM4\1\47.dat" area="Al Zahbi"/>
<rom location="ROM4\1\49.dat" area="Aht Urhgan Whitegate"/>
<rom location="ROM4\1\50.dat" area="Wajaom Woodlands"/>
<rom location="ROM4\1\51.dat" area="Bhaflau Thickets"/>
<rom location="ROM4\1\52.dat" area="Nashmau"/>
<rom location="ROM4\1\53.dat" area="Arrapago Reef"/>
<rom location="ROM4\1\54.dat" area="Ilrusi Atoll"/>
<rom location="ROM4\1\55.dat" area="Periqia"/>
<rom location="ROM4\1\56.dat" area="Talacca Cove"/>
<rom location="ROM4\1\57.dat" area="Silver Sea route to Nashmau"/>
<rom location="ROM4\1\58.dat" area="Silver Sea route to Al Zahbi"/>
<rom location="ROM4\1\59.dat" area="The Ashu Talif"/>
<rom location="ROM4\1\60.dat" area="Mount Zhayolm"/>
<rom location="ROM4\1\61.dat" area="Halvung"/>
<rom location="ROM4\1\62.dat" area="Lebros Cavern"/>
<rom location="ROM4\1\63.dat" area="Navukgo Execution Chamber"/>
<rom location="ROM4\1\64.dat" area="Mamook"/>
<rom location="ROM4\1\65.dat" area="Mamool Ja Training Grounds"/>
<rom location="ROM4\1\66.dat" area="Jade Sepulcher"/>
<rom location="ROM4\1\67.dat" area="Aydeewa Subterrane"/>
<rom location="ROM4\1\68.dat" area="Leujaoam Sanctum"/>
<rom location="ROM4\1\69.dat" area="Chocobo Circuit"/>
<rom location="ROM4\1\70.dat" area="The Colosseum"/>
<rom location="ROM4\1\71.dat" area="Alzadaal Undersea Ruins"/>
<rom location="ROM4\1\72.dat" area="Zhayolm Remnants"/>
<rom location="ROM4\1\73.dat" area="Arrapago Remnants"/>
<rom location="ROM4\1\74.dat" area="Bhaflau Remnants"/>
<rom location="ROM4\1\75.dat" area="Silver Sea Remnants"/>
<rom location="ROM4\1\76.dat" area="Nyzul Isle"/>
<rom location="ROM4\1\77.dat" area="Hazhalm Testing Grounds"/>
<rom location="ROM4\1\78.dat" area="Caedarva Mire"/>
</roms>