Box64Droid: X3 Reunion Super Duper Playable and Fast With Voices... but No Music. See description.
Winetricks are necessary, check the end of the video to see which a had installed.
Update: Music fixed also while stability remains.
Check the beginning of this video for the registry settings https://youtu.be/IQEspJQiGBY
I was trying to make this game to be stable because it crashed in 2 minutes or right after loading before and also had music but no voices.
I managed to make the voices work in expense of the music not working anymore but that also had the pleasant outcome that the game is super duper stable and playable like this. Before it was also completely unplayable because the game always crashed when trying to trade in stations, but not anymore.
I will try to bring back the music to see if it is the problem for the crashes, but either way i love this game and now it's completely playable. It can still crash but after 15-20 minutes and since you can save anywhere it's not a problem at all.