Downloading files from unverified third-party sites like DesireMovies carries significant security risks. While the .mkv format itself is generally safe, these files are often bundled with other threats:

: Another reliable multi-engine scanner is Jotti's Malware Scan, which supports files up to 250MB.

: Upload the file to VirusTotal to have it analyzed by over 70 different antivirus engines simultaneously.

: Some "video" files may be fake and prompt you to download a specific "codec" or "player" to view them; these are almost always malware. Recommended Safety Actions

: If the file is already on your computer, right-click it and select "Scan with Microsoft Defender" (or your installed antivirus) to check for immediate local threats. Scan an item with Windows Security - Microsoft Support