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Matroska Video ( .mkv ). The double extension ( .mkv.mkv ) is often a result of manual renaming errors or automated tagging by file-sharing software. Content Category: Likely adult entertainment/pornography. Security Warning
The double extension might indicate a partial download or a corrupted file header.
Files labeled as popular media are frequently used to distribute trojans or ransomware.
Use a versatile player like VLC Media Player which supports almost all .mkv formats natively.
