I did some extra research on the maptex.tga files. As you know there are two versions. The MapTex.TGA and the MapTex2.tga. I found out that only the high or the low resolution TGA file is used per system. NOT BOTH It doesn't matter if you run it in 800*600 or 1600*1200 the TGA file used will always be the high or low resolution DEPENDING on your system.
It will choose to use a lower resolution TGA if your PC has 128 or less memory. If you have more (I tested with 128MB, 192MB and 256MB) it will use the high resolution TGA.
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