The ".avi" extension stands for Audio Video Interleave , a multimedia container format introduced by Microsoft in 1992. While the format is famous for hosting classic internet horror stories like "Suicidemouse.avi" and "Morbus.avi", "yop6.avi" is likely a private file, a placeholder name, or a typo for a different topic.
If you intended to refer to a different mystery or need a creative piece written about a fictional "cursed" file with that name, I can certainly help with that. What is audio video interleave (AVI)? - Lenovo