What is LTMSG.exe?

The genuine LTMSG.exe file is a software component of Lucent Technologies Messaging Applet by Lucent Technologies.
LTMSG.exe is an executable file that belongs to the Lucent Technologies Messaging Applet, a driver file used to adjust modem options. This is not a critical Windows component and should be removed if known to cause problems. Terminating this process might disconnect an active Internet connection. The Lucent Technologies Messaging Applet is used to support chipsets that are applied in modems developed by various manufacturers. Soft modems take up more resources from the computer, especially the CPU to perform part of the hardware modem's job. Lucent Technologies, Inc. was an American company that developed telecommunications equipment. It was founded in 1996 after the selling-off of AT&T Technologies, a unit of the AT&T Corporation. The company is currently known as Alcatel-Lucent after the merger with Alcatel SA of France in 2006. The company was based in Murray Hill, New Jersey, United States.

LTMsg stands for Lucent Technologies Messaging Applet

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 LTMSG.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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LTMSG.exe file information

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

The process known as ltmsg belongs to software Agere Systems ltmsg or LUCENT TECHNOLOGIES ltmsg by Agere Systems ( or LUCENT TECHNOLOGIES (

Description: LTMSG.exe is not essential for the Windows OS and causes relatively few problems. The file LTMSG.exe is located in the C:\Windows folder (common is C:\Windows\ or C:\WINDOWS\system32\). Known file sizes on Windows 10/8/7/XP are 40,960 bytes (98% of all occurrences) or 53,248 bytes. 
The file is not a Windows core file. The program is not visible. The application starts upon Windows startup (see Registry key: MACHINE\Run, Run). The file is a trustworthy file from Microsoft. Therefore the technical security rating is 25% dangerous, however you should also read the user reviews.

Recommended: Identify LTMSG.exe related errors

If LTMSG.exe is located in the C:\Windows\System32 folder, the security rating is 38% dangerous. The file size is 38,912 bytes (60% of all occurrences), 40,960 bytes or 106,496 bytes. The program is not visible. The application starts when Windows starts (see Registry key: MACHINE\Run, Run). It is not a Windows system file. LTMSG.exe is a Microsoft signed file.

External information from Paul Collins:

Important: Some malware disguises itself as LTMSG.exe, particularly when not located in the C:\Windows folder. Therefore, you should check the LTMSG.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

Maybe started popping up after loading Canon PIXMA MX340 printer control panel for Print, Scan and FAX (that would make sense cause it uses the older Dial-Up my Desktop)
LTMSG.exe 7 is the Lucent (Agere) LT Data/Fax Modem driver for the PCI modem in some older HP Desktops (mine's a HP Pavilion 554e). Since I don't use a dialup modem anymore I disabled the auto-startup and it still works fine. I imagine you'd want to auto-start it if you were receiving faxes on your PC or needed to connect to a remote dialup modem on system startup. If you delete it you will get the yellow exclamation warning in Device Manager under the Modems section. Of course, if you don't have this modem or removed it then this driver is not needed.
  SpudJeff   (further information)
I have a version dated 5/8/2001 and 106,496 bytes and fails to load properly on boot (modem driver not enabled)
Messaging application for Agere Win Modem. any other modem utilizing the Agere Systems chip set. Normally not installed unless user requires Dial up capabilities. Installed thru Windows Update under Hardware updates. Agere is owned now by LSI
  Mike Nickerson  
has something to do with my modem
Lucent winmodem file normally non malicious, i doubt you have anything to worry about from this file. Its merely for reporting errors.
PC based computer acting strange found this running
  Ron Jones  
It's running and I don't use a modem
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of LTMSG.exe: based on 22 votes with 9 reviews. 13 users think LTMSG.exe 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 suspect danger. One user thinks LTMSG.exe is dangerous and recommends removing it. 8 users don't grade LTMSG.exe ("not sure about it").

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Best practices for resolving LTMSG issues

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

LTMSG.exe [all]