Norton Utilities file
File type: Various data file
A .pnnu file is an internal data file used by Norton Utilities for Microsoft Windows.
It is associated with the operation of Norton Utilities rather than intended as a general-purpose document.
File type category:
Various data file
Date updated: September 24, 2026
Norton Utilities is Windows system-maintenance software. The .pnnu file extension identifies data created or used by the program as part of its internal operation.
The precise contents depend on the Norton Utilities component that created the file. The file is not intended to be edited manually and is not a standard interchange format. It is chiefly encountered with Windows installations of Norton Utilities and is not commonly used outside that software.
Open a .pnnu file through the compatible Windows installation of Norton Utilities that created it. The file may be read automatically by the program; it is not normally opened as a standalone document.
A .pnnu file cannot generally be converted to a common document or data format because it contains Norton Utilities-specific internal data.
Use any export or reporting features provided by the compatible version of Norton Utilities when available. Renaming the file does not convert its contents.
Software applications that handle other tasks involving pnnu files:
Microsoft Windows
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