Kaspersky Anti-Virus update file
File type: Various data file
A klz file is an update file used by Kaspersky Anti-Virus for Microsoft Windows. It stores virus definitions used to identify malware.
File type category:
Various data file
Date updated: October 14, 2026
The klz file extension is associated with Kaspersky Anti-Virus, security software for Microsoft Windows developed by Kaspersky. The software uses these files to update its malware detection capabilities.
A klz file contains updated virus definitions. It is an application update resource rather than a document intended for direct use, and it is processed as part of the software's update system.
A klz file is not intended to be opened manually. On Microsoft Windows, Kaspersky Anti-Virus should process it through its update function.
A klz file cannot be meaningfully converted to another file format. It contains update data for Kaspersky Anti-Virus, not user data for export.
Use the software's update function to install the definitions instead of converting the file.
Software applications that handle other tasks involving klz files:
Microsoft Windows
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