XC2 formats for XCDE

[darkwingcraft]

Time to ask for help again. Sprites like maps and battle UI are in the ".wilay" format. I cannot find anything useul on this format anywhere; the one and only search result is this, with nothing within but "LAHD Texture", and that phrase doesn't have any relevant search results at all. Any ideas?

There is something equally useless here https://tcrf.net/User:BlockBuilder57/XBC...enu_Images 

"A male humanoid common Blade with his Greataxe. It seems possible that the design for common Blades was to be used for a rare Blade, due to the filename's index (fim_bl_042.wilay) having a 0 prefix. Its glow texture is from the next image." I've seen that naming format but with png as extensión. So long shot, maybe is just an image compressed with a looseless algorithm, like png files, maybe try with an image editor like gimp or photoshop?