CRT

CRT is a simple uncompressed bitmap image file format used in Carnivores: Dinosaur Hunter and Carnivores: Ice Age; files may also use the extensions CRTLM or CRTHD.

Format
24-bit pixels use RGB888 while 32-bit pixels use RGBA8888.

Because of the very simple format, it's trivial to calculate filesize in bytes to confirm a file is valid:. For example, a 1024x1024 32-bit image should have a filesize of 4,194,309 bytes.