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---
topic: sample
description: "A minifilter that demonstrates registration with the filter manager."
languages:
- cpp
products:
- windows
---
<!---
name: NullFilter File System Minifilter Driver
platform: WDM
language: cpp
category: FileSystem
description: A minifilter that demonstrates registration with the filter manager.
samplefwlink: http://go.microsoft.com/fwlink/p/?LinkId=617653
--->
# NullFilter File System Minifilter Driver
The NullFilter minifilter is a sample minifilter that shows how to register a minifilter with the filter manager.
## Universal Windows Driver Compliant
This sample builds a Universal Windows Driver. It uses only APIs and DDIs that are included in OneCoreUAP.
## Design and Operation
The *NullFilter* minifilter is a simple minifilter that registers itself with the filter manager for no callback operations.
For more information on file system minifilter design, start with the [File System Minifilter Drivers](http://msdn.microsoft.com/en-us/library/windows/hardware/ff540402) section in the Installable File Systems Design Guide.
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