Regardless of the content, an file (formally MPEG-4 Part 14 ) is a digital multimedia container format. According to experts at Adobe , these files are favored for their ability to store high-quality video and audio while maintaining a small enough size for easy online streaming.
If you downloaded the file from an unknown site, run it through a security scan before opening. 80499.mp4
Knowing if it was on a social media thread, a specific website, or an old hard drive would help in identifying the exact content. Regardless of the content, an file (formally MPEG-4