Julie.mp4.mkv.mp4 May 2026

Because Windows might hide the .exe extension, the user only sees GreatVideo.mp4 .

Every file on your computer has a file extension—a suffix consisting of a period followed by a few letters (like .jpg , .pdf , or .mp4 ). This extension tells your operating system which program should be used to open the file. JULIE.mp4.mkv.mp4

Stacking extensions is a classic hallmark of someone trying to bypass automated email filters or security scanners that look for specific file types. 🛑 Best Practices to Stay Safe Because Windows might hide the