What is cgmopenbho.dll?

The genuine cgmopenbho.dll file is a software component of CGM Open BHO by CGM Open Consortium.
Designed for users interested in developing a WebCGM viewer, this browser helper object allows Internet Explorer to support the user-created view. A WebCGM viewer is a means of displaying computer graphics metafiles. CGM is a standard for various vector and raster graphics as well as text, and are used for a multitude of engineering and technical applications. Released by the CGM Open Consortium, support for CGM Open BHO has been available since 2001.

Cgmopenbho.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 CGM Open BHO.

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Cgmopenbho.dll file information

The process known as CGM Open BHO belongs to software CGM Open BHO or Arbortext IsoView or IsoView or SDI CGM Reader or or Corel ActiveCGM Free Browser or Corel ActiveCGM Browser by CGM Open Consortium (

Description: Cgmopenbho.dll is not essential for Windows and will often cause problems. The file cgmopenbho.dll is located in the C:\Windows\System32 folder or sometimes in a subfolder of C:\Windows or in a subfolder of "C:\Program Files" or in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 86,016 bytes (75% of all occurrences) or 90,112 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 56B38F40-4E70-11d4-A076-0080AD86BA2F. The program has no visible window. The file is able to monitor web browsers. The service has no detailed description. The cgmopenbho.dll file is not a Windows system file. The cgmopenbho.dll file is located in the Windows folder, but it 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 have any problems with cgmopenbho.dll, you can completely remove IsoView or Corel ActiveCGM Browser (Control Panel ⇒ Uninstall a Program).

Recommended: Identify cgmopenbho.dll related errors

External information from Tony Klein:

Important: Some malware disguises itself as cgmopenbho.dll, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the cgmopenbho.dll process on your PC to see if it is a threat. If CGM Open BHO 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

close the windows of I.E , for ex:
maybe responsible for crashing IE Browser with Applet (Sun Java)
Crashed IE6 & 7until I removed with Hijackthis
  C S Turnbull  
In my case, associated with images of aircraft maintenance software data.
ITEDO IsoView uses this file and is SAFE ! Without this, certain vital programs for business puposes, used for displaying images, will not be able to display the images (i.e. E-product catalogues; one of which I support myself).
  JoLea74   (further information)
Installed by PTC's Arbortext 5.3 M050; detected as false positive by McAfee VirusScan DAT 6187 and later
Associated with the SAAB WIS and EPC sofware
Was redirecting all browser activity - Essentially the same as DNS Changer. - Tried going to any popular Antivirus website, would end you up at all sorts of advertising/hack websites.
associated with Volvo VIDA and ISOVEIW.
Used by Java when logging in to Danish NemId.
  Johnny Petersen  

Rating chart

Summary: Average user rating of cgmopenbho.dll: based on 8 votes with 10 user comments. 5 users think cgmopenbho.dll is essential for Windows or an installed application. One user suspects danger. 2 users think cgmopenbho.dll is dangerous and recommend removing it. 2 users don't grade cgmopenbho.dll ("not sure about it").

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Best practices for resolving cgmopenbho issues

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

cgmopenbho.dll [all]