15.4.3555.0308 59.81%
15.4.3538.0513 12.68%
15.4.3508.1109 21.53%
15.4.3502.0922 5.98%



Windows Live Messenger Companion by Microsoft Corporation (Signed)

Remove companioncore.dll


There are 4 versions of companioncore.dll in the wild, the latest version being 15.4.3555.0308. It is integrated as a plugin to Internet Explorer as a Browser Helper Object, often without any obvious user interface, and will load for each instance of IE. The average file size is about 384.38 KB. The file is a digitally signed and issued to Microsoft Corporation by Microsoft Corporation.

What is companioncore.dll?

Windows Live Messenger (formerly named MSN Messenger) is an instant messaging client part of Microsoft's Windows Live. Windows Live Messenger uses the Microsoft Notification Protocol (MSNP) over TCP (and optionally over HTTP to deal with proxies) to connect to Microsoft Messenger service.


File name:companioncore.dll
Publisher:Microsoft Corporation
Product name:Windows Live Messenger Companion
Description:Windows Live Messenger Companion Core
Typical file path:C:\Program Files\windows live\companion\companioncore.dll
Issued to:Microsoft Corporation
Authority (CA):Microsoft Corporation

ResourcesPrograms installed in

(Note, the programs listed below are for all versions of Windows Live Messenger Companion.)
Microsoft Corporation
10% remove
Windows Live Essentials is a suite of freeware applications by Microsoft that aims to offer integrated and bundled e-mail, instant messaging, photo-sharing, blog publishing, and security services. Ess...
Microsoft Corporation
9% remove
Windows Live "is a way to extend the Windows user experience". Windows Vista provides a link in its user interface to download Windows Live Messenger, and Windows 7 saw the removal of applications suc...
Microsoft Corporation
7% remove
Windows Live Messenger Companion was an add-in for Windows Internet Explorer that detects when a user is on a website that one of their friends has shared content from and surfaces that update so that...


(Note, the behaviors below are for all versions of companioncore.dll, select a unique version for details.)
Internet Explorer Browser Helper Object
Located in the registry at 'SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects'
  • BHO CLSID: {9FDDE16B-836F-4806-AB1F-1455CBEFF289}
Internet Explorer extensions
  • CLSID: {0000036B-C524-4050-81A0-243669A86B9F}

VersionsAll file variations of companioncore.dll

MD5SHA-1File size
8513a7bb078a669e75f2adc3fb007b24 8f3e6fedd94e6730d599b12ec65cf3f34d327dc1 384.38 KB
0ee505f20817f13dea0c6907a94469d2 6ba39bec867dca83c13fa3550a3a914c996745c5 384.38 KB
47bdbce3e2d819b17ab9fa4539b9df71 a8af89237c0d0b6e85018efe104f9149a2ae5c30 384.38 KB
093796100ba5f40f873fbcdc2a6c5baa 84fe588de3d3289ce5f3c83c8eaa36548f69240b 384.38 KB

Windows OS versionsDistribution by Windows OS

OS versiondistribution
Windows 7 Home Premium 42.25%
Windows 7 Ultimate 18.25%
Windows Vista Home Premium 18.25%
Windows 7 Professional 6.25%
Windows Vista Home Basic 4.00%
Windows 8 Pro 3.50%
Windows 8 Pro with Media Center 2.50%
Windows 7 Home Basic 1.75%
Windows Vista Ultimate 1.25%
Windows 7 Starter 0.75%
Windows 7 Home Premium N 0.50%
Windows 7 Enterprise 0.50%
Windows Vista Business 0.25%

Distribution by countryDistribution by country

United States installs about 41.75% of Windows Live Messenger Companion.

OEM distributionDistribution by PC manufacturer

PC Manufacturerdistribution
Hewlett-Packard 23.41%
Dell 19.65%
Toshiba 17.92%
Sony 10.98%
Acer 8.67%
ASUS 7.51%
Samsung 3.18%
NEC 1.16%
American Megatrends 1.16%
Lenovo 1.16%
Medion 1.16%
Gateway 1.16%
Sahara 0.58%
Packard Bell 0.58%
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