I want to understand why some games have their bezels horizontaly 'stretched', like if they were displayed in a 16:9 format instead of regular 4:3 format.
One example of game that suffer from that issue is Renegade. The game's bezel is a square, but when you apply it into MAME, it becomes stretched. It appears to happen to all low-res games. Another example is Ghosts'N Goblins.
What can I do to fix that issue? I've tried different values in the .lay file but without success. A hint here would be great. I'm using it with a 19" LCD monitor configured at 1440x900 32bpp @60hz.