What is GWMDMMSG.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the GWMDMMSG.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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GWMDMMSG.exe file information

Windows Task Manager with GWMDMMSG
GWMDMMSG.exe process in Windows Task Manager

The process known as Modem Messaging Applet belongs to software GTW Modem Messaging Applet by GTW (

Description: GWMDMMSG.exe is not essential for Windows and will often cause problems. The GWMDMMSG.exe file is located in the C:\Windows folder. Known file sizes on Windows 10/8/7/XP are 90,112 bytes (68% of all occurrences), 65,536 bytes or 101,615 bytes. 
It is not a Windows system file. The program is not visible. The software starts upon Windows startup (see Registry key: MACHINE\Run). It is a Microsoft signed file. Therefore the technical security rating is 34% dangerous, however you should also read the user reviews.

Recommended: Identify GWMDMMSG.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as GWMDMMSG.exe. Therefore, you should check the GWMDMMSG.exe 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

gwmdmmsg.exe is part of GTW modem messaging applet by GTW. Goes with internal modems on Gateway and vprMatrix PCs.

Summary: Average user rating of GWMDMMSG.exe: based on 1 vote with 1 user comment. One user thinks it's neither essential nor dangerous.

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Best practices for resolving GWMDMMSG issues

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

GWMDMMSG.exe [all]