It took me a looong time to get FFXI working on Linux. In the end I got it working by NOT doing what the majority of the three different guides I found instructed. They are needlessly complicated. SO I'm going to outline what I did to get FFXI running on my Manjaro Linux KDE set up. Installing it is really easy actually. Of course, each system is different and this may or may not work for yours.

1. Install the latest version of Wine. I'm using 1.9.23. DONT use PlanOnLinux or Winetricks.
2. Download "FFXI with everything" at http://nasomi.com/download.php
3. Run 64bit POL.exe
4. Open ffxisetup.exe and install FFXI and all of the expansions. Don't install POL. The program may freeze after it installs each expansion. If that happens, just close it and relaunch ffxisetup.exe. The program should indicate the previous expansion you installed is installed and prompt you to install the remaining expansions.
5. Open the update files folder, and select all the files and copy them
6. Paste all of those files into /.wine/drive_c/Program Files (x86)/PlayOnline/SquareEnix/FINAL FANTASY XI/ and overwrite all of the duplicates
5. Run POL.exe. It should be on your menu or located at /.wine/drive_c/Program Files (x86)/PlayOnline/SquareEnix/PlayOnlineViewer/
6. POL will prompt you to update POL. Do it.
7. After POL updates and restarts select existing user. Use ABCD1234, or whatever, as your POL ID and make up a username.
8. On the left side click "Check Files" and CHANGE THE DROPDOWN to read FINAL FANTASY XI.
9. Click "Check Now", this process can take 10-60 minutes. Eventually it will come up with "Repair". Select that. This can take a few hours.
10. Copy the "data" folder located at /.wine/drive_c/Program Files (x86)/PlayOnline/SquareEnix/PlayOnlineViewer/
11. Paste the data folder into /.wine/drive_c/Program Files (x86)/PlayOnline/SquareEnix/FINAL FANTASY XI/
12. Download imm32.dll.so file at: https://github.com/bluffnix/ffxi-wine/b ... m32.dll.so
13. Move imm32.dll.so to /usr/lib32/wine/. Overwrite the file that's already there.
14. Download xiloader at http://cloudef.pw/armpit/xiloader.tar.xz
15. Move xiloader to /.wine/drive_c/Program Files (x86)/PlayOnline/SquareEnix/PlayOnlineViewer/ (may not be necessary but it's where I like to keep it)
16. Open a terminal at /.wine/drive_c/Program Files (x86)/PlayOnline/SquareEnix/PlayOnlineViewer/ and type "wine xiloader.exe --server nasomi.com"
16. You should be prompted for a login.

Good luck! Let me know if I missed anything. If you need help creating a desktop icon that runs the terminal command let me know.

Thank You very much. I'll try this soon.

For all brazilians or other places with a different time-zone: I could only begin the install procedure by changing the time zone to America/NY, wine reported errors about it and I searched and found this out. Lost the command now, but it's not only changing the hour, it has something to do with system configurations. But it's easy =)

Kinda weird that you had to change the time zone but glad it worked.

Working flawlessly for 64 bit Arch.

Thank you for the guide.

So, running into a bit of an issue with this guide, the moment i stick imm32.dll.so into the /usr/lib32/wine folder, i start getting ELF errors and nothing works until I put back the original imm32.dll.so using Antergos its arch varient