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Be extremely careful about where you downloaded the file. A recent "7zip malware" campaign used fake domains like 7zip.com (the real one is .org ) to distribute Trojans that turn PCs into proxy nodes.

How to Install, Compress & Encrypt Files with 7-Zip | Lenovo IE Basket.7z

If the file asks for a password, it likely uses AES-256 encryption, which is nearly impossible to bypass without the correct key. Be extremely careful about where you downloaded the file