WLD files have X=north/south, Y=east/west, and Z=up/down. X increases towards north and Y increases towards west. It's what's called a right-handed coordinage system, which means this: take your right hand. Extend your index finger out from your arm like you're pointing. This is the X axis. Extend your middle finger so that it points to your left. That's the Y axis. Extend your thumb up at the ceiling. That's the Z axis.
Hope this helps,
WC
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