An application that I use and recommend is paint.net. When you save the image in .bmp mode you will have to put 8 bit and put the interpolation level to the maximum.
One of my favorite TMP skins for this game are the dual TMP's: https://gamebanana.
i am having a problem with the half like model viewer where for some reason whenever i close iteven...
I want to use the Millenia's CS16 weapon retexture pack.
First of all, it's not a map bug, more like in the engine itself.