What is dlportio?

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

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Dlportio.sys file information

The process known as DriverLINX Port I/O Driver or hwinterfacex64.sys (version x64 hwinterface Driver) belongs to software DriverLINX Port I/O Driver or hwinterfacex64 Driver (version 1.1 x64 port by Highresolution Enterprises www...) by Logix4u (

Description: Dlportio.sys is not essential for the Windows OS and causes relatively few problems. Dlportio.sys is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/8/7/XP is 3,584 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. There is no information about the author of the file. The program is not visible. The service has no detailed description. It is not a Windows system file. dlportio.sys appears to be a compressed file. Therefore the technical security rating is 54% dangerous; however you should also read the user reviews.

Recommended: Identify dlportio.sys related errors

If dlportio.sys is located in the C:\Windows\System32 folder, the security rating is 42% dangerous. The file size is 5,632 bytes. The program is not visible. Dlportio.sys is not a Windows core file. dlportio.sys appears to be a compressed file.

Important: Some malware disguises itself as dlportio.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the dlportio.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

DriverLINX Port I/O driver used by F2AWriter (GBA transfer utility)
device I/O on printer port
Part of the port95nt.exe driver for controlling parallel port, often used to control parallel displays
Kernel driver for allowing Port I/O from user mode
  Joey Jo Jo   (further information)
Redirected Port(Driver) for local PDF Printer
It is required by some microcontroller programmers contected to the printer port
  P Paradigm  
It is used by software developers who need direct port access on Windows without having to resort to using the complicated Windows SDK. The copyright holder is Scientific Software Tools Inc.
  dgh   (further information)
Parallel port driver allowing read and writes via their api. Provided (but no longer supported) by DriverLinx.
  Jordan Walters  
DLPortIO.SYS download
Its a linx parallel driver use o communicate with windows
Device driver for contolling I/O port. Written by Candian Technologies. I have been using this driver for years.
  Alan Taylor  
This is a driver used for the parallel port on your computer. If you use C++ or Turing, you will know what i mean. Its a driver needed for your parallelports...dont delete it.
Software running on Windows 98 or before can access parallel ports directly to control a piece of hardware connected to a parallel port. S/W running on NT, XP, or later needs something like DLPORTIO to simplify access to parallel ports.
  Advin Systems   (further information)
I use it for timing applications by viewing PPort bits

Rating chart

Summary: Average user rating of dlportio.sys: based on 30 votes with 15 user comments. 24 users think dlportio.sys is essential for Windows or an installed application. 2 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 2 users don't grade dlportio.sys ("not sure about it").

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Best practices for resolving dlportio issues

A clean and tidy computer is the key requirement for avoiding problems with dlportio. 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 dlportio.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

dlportio.sys [all]