Dt30-g4.cpk < Fast >

are used by developers to open this file and extract its internal textures for editing.

is a molecular coordinate file containing a single conformation or frame from a simulation or docking study. The .cpk extension typically indicates CPK coloring (Corey-Pauling-Koltun) atomic coordinates, often used for visualization in molecular graphics software (e.g., PyMOL, VMD, Chimera). Dt30-g4.cpk

If it is a true CPK