Inside the extracted folder, you will see subfolders like chara/goku/tex/ . Look for costume01_d.dds (the diffuse texture for Goku’s default outfit). Open it in your image editor.
Before using an editor, it helps to understand what is inside. A CPK file uses a hierarchical structure: cpk file editor
Alex leaned back in his chair, a massive grin spreading across his face. He hadn't just played the game; he had rewritten its rules. He had wrestled with the proprietary beast and won. Inside the extracted folder, you will see subfolders
Some older game engines will crash if the new CPK is significantly larger than the original. Use compression settings if available. Header Errors: Inside the extracted folder