What is Apfiltr?

The genuine Apfiltr.sys file is a software component of Alps Touch Pad Filter Driver by Alps Electric Co..
This driver is used to interface between Microsoft Windows and the Alps Touchpad. The Alps Touchpad is incorporated into several brands of laptops, including Dell, Acer, and Fujitsu. A touchpad is an input sensor built into the keyboard of most laptops to control the cursor instead of a standard mouse.

ApFiltr stands for Alps Touch Pad Filter

Apfiltr.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if Apfiltr.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for Apfiltr drivers in need of updating

Apfiltr.sys file information

The process known as Alps Pointing-device Driver or Alps Touch Pad Driver or Alps Pointing-device Filter Driver or Alps Touch Pad Filter Driver for Windows (version x64)

belongs to software Alps Pointing-device Driver for Windows (version 2000/XP) or Alps Touch Pad Filter Driver for Windows (version 2000/XP/Vista, x86) or Alps Touch Pad Driver for Windows (version 2000/XP)

by Alps Electric Co. (

Description: Apfiltr.sys is not essential for the Windows OS and causes relatively few problems. Apfiltr.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 101,874 bytes (33% of all occurrences), 101,833 bytes, 155,136 bytes, 108,767 bytes or 345,424 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. The file is not a Windows system file. Apfiltr.sys appears to be a compressed file. Therefore the technical security rating is 23% dangerous.

Recommended: Identify Apfiltr.sys related errors

Important: Some malware disguises itself as Apfiltr.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the Apfiltr.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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2 users think Apfiltr.sys is essential for Windows or an installed application.

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Best practices for resolving Apfiltr issues

A clean and tidy computer is the key requirement for avoiding problems with Apfiltr. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the Apfiltr.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

Apfiltr.sys [all]