The KLQ extension is assigned to files that are associated with Kaspersky Anti-Virus. KLQ files are used to store data containing viruses in an encrypted format. It is a quarantine file. Such viruses may be quarantined at the user's discretion or when the program is unable to remove the threat.

Kaspersky Anti-Virus separates dangerous files from the system in a way that does not allow them to have any impact on its operation.