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By replacing the header with a DXT5 header I was able to get a .dds file to open in Photoshop.
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This is the black paint job I was looking for. Along with the original spots/decals.
For anyone who is researching .RTT just find the correct size or assumed size and create photoshop documents of the following.
64x64, 128x128, 256x256, 512x512, 1024x1024, 2048x2048, 4096x4096
These will be the headers to the texture files for the assumed sizes.
https://drive.google.com/file/d/1aJ5v6F ... sp=sharing
NOTE some textures can be 512x1024 or 2048x1024. You will have to make the size document to your assumed texture and trail and error until you come across the right one. You can usually tell by the size of the .dds preview.