What is mscoree.dll?

The genuine mscoree.dll file is a software component of Microsoft .NET Framework by Microsoft Corporation.
"MSCorEE.dll" is a Microsoft library file which is essential for the execution of "managed code" applications written for use with the .NET Framework. It resides in "C:\Windows\System32". Only one instance runs at a time. It is called when execution begins of a managed code Portable Executable (PE) file, which has a ".exe" suffix like a machine-language file but is different internally. "MSCorEE.dll" consults the manifest that is always associated with a .NET assembly. (An assembly can have one or more files, one of which always is or includes the manifest). "MSCorEE.dll" determines which version of the .NET Framework's Common Language Runtime (CLR) to call; the CLR then compiles the Common Intermediate Language (CIL) in the assembly into executable machine code. The CLR also provides all assemblies with standard infrastructure like disk I/O, memory management and garbage collection.

MsCoREE stands for Microsoft .NET Common Language Runtime Execution Engine

Mscoree.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. You can fix your mscoree.dll problem by downloading the correct mscoree.dll file. The following paragraph provides more information about Microsoft .NET Runtime Execution Engine.

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Mscoree.dll file information

The process known as Microsoft .NET Runtime Execution Engine belongs to software Microsoft .NET Framework (version 4 Client Profile, 4 Client) or Microsoft Windows Operating System by Microsoft (

Description: Mscoree.dll is not essential for the Windows OS and causes relatively few problems. The mscoree.dll file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 297,808 bytes (78% of all occurrences), 282,112 bytes and 10 more variants. 
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 10EDB994-47F8-43F7-AE96-F2EA63E9F90F or 0bc6e3fa-78ef-4886-842c-5a1258c4455a or 61 more variants. The program has no visible window. The file is not a Windows system file. There is no detailed description of this service. The file is able to change the behavior of, or monitor Internet Explorer. It is certified by a trustworthy company. Therefore the technical security rating is 49% dangerous; but you should also compare this rating with the user reviews.

Uninstalling this variant: If you encounter difficulties with mscoree.dll, you can uninstall Microsoft .NET Framework 4 Client Profile or Microsoft .NET Framework 4 software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

Recommended: Identify mscoree.dll related errors

If mscoree.dll is located in a subfolder of "C:\Program Files", the security rating is 32% dangerous. The file size is 276,248 bytes. The program can be uninstalled in the Control Panel. The program has no visible window. The mscoree.dll file is a Verisign signed file. It is able to monitor web browsers. The mscoree.dll file is certified by a trustworthy company. The service has no detailed description. It is not a Windows system file.

Uninstalling this variant: If you encounter difficulties with mscoree.dll, you can contact Customer Service or uninstall Ript software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

External information from Tony Klein:

Important: Some malware disguises itself as mscoree.dll, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the mscoree.dll process on your PC to see if it is a threat. If Microsoft .NET Runtime Execution Engine 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

Part of Microsoft .NET Framework
  Alex   (further information)
trixie browser extension
when i googled the registry number (starting "95663..."), I came up with a host of references to FilePrintFedExKinko's, which I do have installed on my machine. I think this may be the browser helper for that program. If you don't have the program, you probably don't need the .dll.
  Ken P   (further information)
Think it has to do with my ACT 2006
  The Major  
Arose in XP repair.
was not a part of windows 98 oe nt installation
This constant error message can be solved the right way if you go to ' '. As part of Microsoft .NET framework it's a necessary file. But malware like Uniblue/Advanced PC tweaker (out of Malta) use the error message to snag the unaware into buying their useless/potentially dangerous programs. Fair warning: just because a site claims it has 'Microsoft Approved' or other seemingly legitmate rating don't get sucked in! ANY company that plunks down enough cash seems to be able to get a 'Microsoft Approved' rating.
  Kirsten R.   (further information)
This file is part of the .NET framework. Programs that rely on .NET need this file (among others) in order to run successfully.
  Dave Wright   (further information)
Part of application for MS Outolook, possible the Doodle event scheduler, Hitman Pro and my virusscanner leave it alone
  Jan Malenstein  
started by hklm/software/classes/protocols/filter 3 times as: application/octed-stream, -/x-complus and -/x-msdownload (reported by sysinternals autoruns) on my infected system (security tool, 3-20010)
  windoom   (further information)
its to do with video
Part of .Net Runtime
Security Task Manager say is this is pontetially dangerous
It seems to be a part of TeamViewer Meeting Add-In for Outlook. if you dont need Teamviewer Meeting, you can dissable it in Teamviewer
Required for any .Net 4 applications. Not malicious.
Part of .NET
Seems to be an essential part of .NET
  Fred Yo/da   (further information)
It's used for ResourceFinder Add-in for Outlook 2016. Sometimes causes Outlook to crash, but I don't believe it's dangerous.

Rating chart

Summary: Average user rating of mscoree.dll: based on 24 votes with 18 user comments. 14 users think mscoree.dll is essential for Windows or an installed application. 6 users think it's neither essential nor dangerous. 4 users think mscoree.dll is dangerous and recommend removing it. 4 users don't grade mscoree.dll ("not sure about it").

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Best practices for resolving mscoree issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active mscoree process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the mscoree.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

mscoree.dll [all]