Yes it has the exact same file name aswell, I can open it and view it with my image viewing program so it's not corrupted nothings wrong with it.Have you checked if you have the missing file in your game folder? If not you should download my file and put, or replace, that one in www -> img -> tilesets.
But I overwrote it with your's just cause why not, and it makes no difference issue remains.
It's like the application itself fails to load the file, but why seemingly only I in the entire world (afaict) have this issue is ridiculous.
Edit: Oh I have also tried making a new game incase it was something with using old save files causing the issue, but it does not matter it always crash when trying to load that asset file no matter what.