What is MMDiag.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 MMDiag.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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MMDiag.exe file information

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

The process known as Logging and tracing manager belongs to software Musicmatch Jukebox or Logging and tracing manager or MusicMatch Jukebox or MUSICMATCH JUKEBOX by Musicmatch ( or MusicMatch ( or MUSICMATCH (

Description: MMDiag.exe is not essential for the Windows OS and causes relatively few problems. The MMDiag.exe file is located in a subfolder of "C:\Program Files" (usually C:\Program Files\Musicmatch\Musicmatch Jukebox\). Known file sizes on Windows 10/8/7/XP are 102,400 bytes (91% of all occurrences), 86,016 bytes, 65,536 bytes, 110,592 bytes or 69,632 bytes. 
The program has no visible window. It is not a Windows system file. Therefore the technical security rating is 43% dangerous, however you should also read the user reviews.

Uninstalling this variant: If there are any problems with MMDiag.exe, you can also go to the support area of the Musicmatch-jukebox website, find out if there is a newer version available or uninstall the associated program (Start > Control Panel > Uninstall a Program > Musicmatch® Jukebox or Volume Logic Plug-in for).

Recommended: Identify MMDiag.exe related errors

Important: Some malware camouflages itself as MMDiag.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the MMDiag.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

It's a musicmatch process. Commenting it out is OK
can be troublesome, mine completed 17,000,000 page faults in 12 hours. I delete the file and musicmatch is fine.
It worked fine for 2 years, now it page faults constantly - 2.5 million page faults so far today. It works on some systems, bad on other. I deleted it and musicmatch works fine.
Renamed mmdiag.exe that seems to have fixed the problem. MM opens fast and no error message
its part of Musicmatch 10
musicmatch says it's a diagnostic file. I renamed 3 instances - caused no problems
If you use Musicmatch Jukebox, keep this file. I've had it forever, and my system works fine. It does not eat up my memory, cause me error messages, page faults, or the disabling of the Jukebox. If you know you're not going to be using MMJ, open Task Manager, and end it's process (until system restart). Might as well end mim.exe, too since they go hand-in-hand. Or, you could uninstall the Jukebox in Add or Remove Programs.
  Haggis McMutton   (further information)
As you said MusicMatch tracking, I just deleted it. Now everything works...Thanks
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of MMDiag.exe: based on 27 votes with 9 reviews. 13 users think MMDiag.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 5 users think it's neither essential nor dangerous. 5 users suspect danger. One user thinks MMDiag.exe is dangerous and recommends removing it. 6 users don't grade MMDiag.exe ("not sure about it").

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Best practices for resolving MMDiag issues

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

MMDiag.exe [all]