What is hwinterface?

The genuine hwinterface.sys file is a software component of Inpout32.dll by Logix4u.
Hwinterface.sys is a system driver that lets software programs operate through the printer port to control hardware. It belongs to Inpout32.dll, a link library used for parallel port interfacing functionality. Drivers enable hardware components to communicate with software without additional programming from the software developer. This file is not a critical Windows component and should be removed if known to cause problems. Inpout32.dll is a DLL (Dynamic Link Library) file that is used for communicating between different hardware ports (an electronic interface between a computer and another computers or peripheral devices. The file is offered for free with source code for developers wishing to use its embedded kernel mode driver to quickly build custom hardware for computers. No special programming interfaces are required to use the driver. Logix4u is a company that develops free software for software developers.

HwInterface stands for Hardware Interface system driver

Hwinterface.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 hwinterface.sys is a Windows system file or if it belongs to an application that you can trust.

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

Hwinterface.sys file information

The process known as Buzz driver belongs to software hwinterface Driver or Ham Radio Deluxe parallel port access by Logix4u ( or Buzz.

Description: Hwinterface.sys is not essential for Windows and will often cause problems. The hwinterface.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 3,026 bytes (88% of all occurrences) or 2,996 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 hwinterface.sys file is not a Windows core file. hwinterface.sys appears to be a compressed file. Therefore the technical security rating is 39% dangerous; however you should also read the user reviews.

Recommended: Identify hwinterface.sys related errors

Important: Some malware camouflages itself as hwinterface.sys. Therefore, you should check the hwinterface.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.


User Comments

Driver for the Parallel Port installed by the Dll Inpout32 ( The function "inst", implemented in the Inpout32 Dll, extract 'hwinterface.sys' from binary resource to 'systemroot\drivers' directory and creates a service. This function is called when 'Opendriver' function fails to open a valid handle to 'hwinterface' service.
  Pablo   (further information)
This file is a driver that allows applications to use the printer port to control hardware. The source code for the driver is available ( ), so someone could add a virus if they wished. However, this file is frequently used by hobby people that build custom hardware that connects to the printer port.
  Edward Handrich   (further information)
Driver used by inpout32.dll to access parallel port on windows xp
  Patricio Ghirardi   (further information)
hwinterface.sys is not a virus, trojan, spyware, adware, it is used for parallel port interfacing. The source code for the hwinterface.sys is available in it's owner's website. Please look at the source code for more info.
  Lily   (further information)

Summary: Average user rating of hwinterface.sys: based on 5 votes with 4 user comments. One user thinks it's probably harmless. 4 users think it's neither essential nor dangerous.

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Best practices for resolving hwinterface issues

A clean and tidy computer is the key requirement for avoiding problems with hwinterface. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the hwinterface.sys process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

hwinterface.sys [all]