What is mdhelper.dll?

Mdhelper.dll is a browser extension for Internet Explorer. This add-on enables several additional functions for Internet Explorer. You can disable it through the Extras menu (key combination Alt + X) under Manage Add-ons. The following paragraph provides more information about MDHelper Module.

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Mdhelper.dll file information

The process known as MDHelper Module belongs to software MetaProducts Mass Downloader or MDHelper Module by Microsoft (

Description: Mdhelper.dll is not essential for the Windows OS and causes relatively few problems. The mdhelper.dll file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 57,344 bytes (54% of all occurrences) or 53,248 bytes. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include B930BA63-9E5A-11D3-A288-0000E80E2EDE. The program has no file description. The program is not visible. The mdhelper.dll file is able to monitor web browsers. There is no detailed description of this service. The file is not a Windows core file. Therefore the technical security rating is 69% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you run into problems with mdhelper.dll, you may want to uninstall the program using the Control Panel ⇒ Uninstall a ProgramMetaProducts Mass Downloader.

Recommended: Identify mdhelper.dll related errors

External information from Tony Klein:

Important: Some malware camouflages itself as mdhelper.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the mdhelper.dll process on your PC to see if it is a threat. If MDHelper Module has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


User Comments

Mass downloader
On my system it is required by the excellent Download manager program "Mass Downloader"
  John Golding   (further information)
it only can see if you want to download somthing or not
Mass Downloader
  Ericko777   (further information)
Mass Downloader
  mohamed   (further information)
it is a part of the great Massdownloader
Part of MetaProducts-Massdownloader
  Dan   (further information)

Rating chart

Summary: Average user rating of mdhelper.dll: based on 14 votes with 7 user comments. 12 users think mdhelper.dll is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. One user thinks mdhelper.dll is dangerous and recommends removing it.

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Best practices for resolving mdhelper issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active mdhelper process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the mdhelper.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. 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.

Other processes

mdhelper.dll [all]