A showcase of being able to use 21:9 on Xenosaga Episode 3 (can be done on the other 2 games as well). Used a pnach file made by me, and a host of other settings to get this working right.
UPDATE: SETTINGS BELOW
Enable Cheats
Enable Widescreen patches
in GS Window:
Aspect ratio (Fit to window/screen) - double click to full screen
FMV Aspect ratio override off
Custom window size N/A
Wait for vsync refresh - disabled
GSDX Video settings:
Renderer - OPEN GL Hardware
Interlacing - Automatic default
Texture filtering - Bilinear Ps2
Hardware Renderer settings:
Large frame buffer - on
Internal resolution - depending on system you can do 5x native or 6x (best)
Anisotropic filtering - off
Mipmapping - off
CRC Hac...