.QUA File Extension
Avira AntiVir Quarantined File
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What is a QUA file?
File created by Avira AntiVir, an antivirus application; saves an infected file in an encrypted format so that it cannot be opened manually; used for quarantining files that contain viruses.
Avira AntiVir quarantines infected files by encrypting them and moving them to a safe location. When the software downloads an update that can clean a particular file, it removes the virus, decrypts the file, and moves the file back to its original location.