Importing Textures
From Computing and Software Wiki
Texture maps used by the C4 Engine have the .tex file extension.
For more information about Texture Format, please go Importing a Texture
IMPORTANT
TGA files may be in 8-bit grayscale, 16-bit, 24-bit, or 32-bit format, with or without RLE compression
HEIGHT AND WIDTH OF THE TEXTURE MUST BE POWER OF 2 (example: 2, 4, 8, 32, 64, 128, 256, 512...)
The texture map resources must be created by importing textures from the "..\C4\Import" directory using the Texture Importer tool module.
Start C4. Select Tool Import Texture
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Import Texture window is displayed. Select the texture you want to import and click OK. Another window is displayed.
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Another dialog window display and the default settings are usually appropriate for ordinary color texture maps.
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Then click OK
Texture import into "..\C4\Data\tex"
Return to RCaragogo
References
http://www.terathon.com/wiki/index.php?title=Importing_a_Texture