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The "Rlez" name is often shorthand for "Release," a common naming convention used by underground software distribution groups (often referred to as "the scene"). Because it is a generic name, the specific contents can vary significantly depending on where you downloaded it. Most commonly, it contains: Rlez.7z
Downloading and opening files like Rlez.7z from unverified sources carries high security risks: Upload the file to VirusTotal to see results
To access the files inside, you need an archive manager that supports the LZMA or LZMA2 compression algorithms: Rlez.7z