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---
page_type: sample
description: "Demonstrates how to specify callback functions for different types of I/O requests."
languages:
- cpp
products:
- windows
- windows-wdk
---
<!---
name: PassThrough File System Minifilter Driver
platform: WDM
language: cpp
category: FileSystem
description: Demonstrates how to specify callback functions for different types of I/O requests.
samplefwlink: http://go.microsoft.com/fwlink/p/?LinkId=617654
--->
# PassThrough File System Minifilter Driver
The PassThrough minifilter demonstrates how to specify callback functions for different types of I/O requests.
## 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 *PassThrough* minifilter does not have any real functionality. For each type of I/O operation, the same pre and post callback functions are called. These callback functions simply forward the I/O request to the next filter on the stack.
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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