Can I open a .pnf file?

No usefully — it is compiled binary driver data, not text. Leave it to Windows.

What creates .pnf files?

Windows itself, by precompiling each driver's .inf file for faster installs.

Can I Delete .PNF Files in C:\Windows\INF? (Safe Cleanup)

Q: Can I delete .pnf files?

Yes, Windows regenerates them, but there is no reason to. They are tiny and harmless.

You found .pnf files in a Windows folder and wonder what they are. They are precompiled driver-setup files Windows makes on its own. Here is what they do and whether to touch them.

What a PNF file is

A .pnf file is a Precompiled INF — a binary, ready-to-use version of a driver's text .inf setup script. Windows compiles each .inf into a .pnf the first time it processes a driver so future installs and Plug-and-Play checks are faster. They live in C:\Windows\INF and in driver store folders.

Where they come from

Windows creates them automatically — you never make one yourself. Every installed driver typically has a matching .inf and .pnf pair.

Is it safe to delete?

Technically yes — Windows will simply regenerate a .pnf from its .inf the next time it needs it. But there is no benefit: they are tiny and deleting them only slows the next driver operation slightly. Leave them alone. Do not open or edit them; they are machine-generated binary and useless to read.

How to handle a .pnf file by OS

Windows: a .pnf is a Precompiled INF — a cached binary version of a driver .inf file in C:\Windows\INF. You don't open it; Windows uses it to install drivers faster. A text editor shows only binary data.

macOS / Linux: not used.

Common problems

A stale or corrupt .pnf can occasionally cause driver-install errors. Deleting it forces Windows to recompile from the .inf on the next install.

Can I Delete .PNF Files?