"Set 64" usually refers to a specific batch of data or images in a numbered series. Lost Media / ARGs:
Files are sequentially numbered and categorized for easy integration into digital libraries. Option 2: Professional Announcement Update: Digital Collection Set 64 is now available. The complete version of Hmm Gracel Set 64 Full
While the technical nature of "Set 64" refers to a structured container of data, the existence of these sets speaks to a broader digital phenomenon: "Set 64" usually refers to a specific batch