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.
The process known as CGM Open BHO belongs to software CGM Open BHO or Arbortext IsoView or IsoView or SDI CGM Reader or www.ptc.com or Corel ActiveCGM Free Browser or Corel ActiveCGM Browser by CGM Open Consortium (www.cgmopen.org).
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 70% dangerous; however you should also read the user reviews.
Recommended: Identify cgmopenbho.dll related errors
If cgmopenbho.dll is located in the C:\Windows folder, the security rating is 72% dangerous. The file size is 90,112 bytes (95% of all occurrences) or 98,304 bytes. Cgmopenbho.dll is located in the Windows folder, but it is not a Windows core file. The program is not visible. The cgmopenbho.dll file is able to monitor web browsers. The service has no detailed description. Cgmopenbho.dll is not a Windows system file.
External information from Tony Klein:
Important: Some malware camouflages itself as cgmopenbho.dll. 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 ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active cgmopenbho process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-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 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.