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Quarantine data
File type: Dangerous and malicious file
Files with qrn file extension can be found as quarantine files from some older anti-virus programs or security scanners.
File type category:
Dangerous and malicious file
Date updated: September 4, 2018
Record marked as obsolete and not updated for a long time.
The qrn file extension is sometimes used by various anti-malware, or anti-virus programs for quarantine files. Basically a file archive that contains suspicious or infected files found by scanner.
You probably cannot access these files directly.
Not meant to be converted to anything else.