: Enable "File name extensions" in your folder settings to see the full name of every file.
: Only download media from reputable streaming platforms or official stores. Sexy Madam.mkv.mp4
: Files ending in .mkv.mp4 or .exe.mp4 are often used to hide the true nature of the file. Your computer might hide the last extension, making a dangerous program look like a video. : Enable "File name extensions" in your folder
: If you didn't specifically download this from a source you trust, move it to the trash and empty it. Sexy Madam.mkv.mp4
: Use a service like VirusTotal to upload and scan the file with dozens of antivirus engines at once.