https://us.battle.net/support/en/art...he-game-region
I have 2 different WoW client installs each attached to a different Battlenet ID, my original US and a testing starter EU (Battlenet app installed with newer EU client)
both have SET installLocale "enUS"
both have SET locale US has "enUS" EU has "enGB"
neither have SET portal
All testing on original US client when using Battlenet account.. allowing app to shutdown on game start.
test 1 on US client
edit WTF/Config.wtf add SET portal "EU" change SET local "enGB"
launch wow-64.exe login using my EU test ID
get EU's read TerminationWithoutNotice
after back and forth finally get realm.. and EU realm list. login character.. exit client
WTF/Config.wtf Set portal is gone.
test 2 same client Config.wtf reset to normal
launch World of Warcraft Launcher.exe Battlenet app launches.. login with EU test ID
in game wrong realm get EU realm list .. login character.. exit client
WTF/Config.wtf only changes gametip and realmname .. playing in EU with US settings!
test 3 same client config.wtf reset to normal
launch battlenet desktop app.. battlenet region = US login with EU test account
verify game settings are correct in install and game play directories
{Note with 2 clients the launcher frequently modifies the directories to the wrong client.. and often triggers a 10MB download before client ready to play}
results same as test 2
test 4 same client config.wtf reset to normal then change SET local "enGB"
launch battlenet desktop app .. battlenet region = US login with US existing battlenet account
launch game find WoW client setting up a new account.. region/realm/new character setups
log in on character and exit game.
retart battlenet desktop app find my US test account now has two starter game setups 1 EU 1 US
launcher.db changes but not always.. not sure what triggers the change.