What is Opqz file extension .Opqz file extension is a file extension that is associated with the newest version of widespread ransomware called STOP (Djvu). This malware was discovered by the security researcher recently. Upon infecting a computer, it encrypts files on the computer, renames the affected files, adding .Opqz extension at the end of … Continue reading How to remove Opqz ransomware virus. Decrypt .opqz files.