Ramashan, good point will try and add something to top post about that. I've also accidentally done that to map_regions in PaintShopPro, that one needs Pixel Resize instead of Smart Size.

I was trying to work out why that CTD'd without message whereas having pixels of extra colours (which is effectively what you get) in small area gives you a KTM with message. Just realised it is probably because you've got so many extra colours that it is reading as being over the 200 region limit....

Using the wrong re-size method also messes up the other files though normally with odd graphic effects rather than CTD - for ground_types you'll get lots of pink areas where colour is invalid, for climates you'll have default climate appearing where you have the unknown colour, map_heights you get odd 'mountains' around coast where you've merged land and sea.