: High-resolution scans of promotional art, character designs by Yoshiyuki Sadamoto, and production sketches.

Because this is a .7z file, it likely comes from a community archive or a forum post dedicated to sharing rare "old-web" anime assets. If you are looking for this specific file, it is typically hosted on or specialized anime asset repositories. Common Contents for such archives:

: Behind-the-scenes images often categorized by "volume" or "disc number," which aligns with the "37-38" numbering in your file.