Platform: Windows (Wine/Gentoo LInux)
ISP: Telia
Type of Internet Connection: 4G
Internet Connection Speed: 0-30 Mbps
Date & Time: 2019-06-24
Frequency: Always
Character Name: Dragoy
Race: Hume Male
World: Fenrir
Main Job: Samurai
Support Job: Bard
Area and Coordinates: PlayOnline Viewer
Party or Solo: Solo Party
NPC Name: pol{,boot}.exe
Monster Name: FFXIFullSetup_EU
Steps:
  1. Download the installer/data files linked to at: http://www.playonline.com/ff11eu/download/media/install_win.html
  2. Install the PlayOnline Viewer.
  3. Observe none of English, Français, or Deutsch being selected as the language in the PlayOnline Viewer.
Normally one can not de-select the language, so it would always be either English, Français, or Deutsch. It seems like this is also being used to determine the current region, and with none of the previously mentioned languages being set, it will be NA.

One of the effects this has, is that when launching Final Fantasy XI via the PlayOnline Viewer, the ESRB notice is displayed (which does not apply to the Europe).

Another is that the incorrect timezone is used in certain places (probably only within the PlayOnline viewer).

Differences between the UK and US English within the PlayOnline Viewer are perhaps probably possible too.

The previous installer(s) would ask for the language to be used at the very beginning of the installation process, and I imagine this would carry on to the PlayOnline Viewer's settings. This step was probably dropped due to English being the only supported language nowadays, and as such, the viewer could default to it as well (which it kind of does already, but therein lies the crux of the problem).

Thanks!