What is CALMAIN.exe?

The genuine CALMAIN.exe file is a software component of Canon Camera Access Library by Canon.
A library of necessary files to run the Canon Camera Window application, the Camera Access Library runs in the background and provides the appropriate files for Camera Window to load. Camera Window starts automatically when your PC detects a Canon camera plugged into it. Founded in 1937, Canon Inc. is a Japanese corporation that has transitioned from a company that focuses on traditional film and development to a digital leader in camera and video development.

CALMain stands for Camera Access Library Main

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the CALMAIN.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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CALMAIN.exe file information

Windows Task Manager with CALMAIN
CALMAIN.exe process in Windows Task Manager

The process known as Canon Camera Access Library (version 8) belongs to software Canon Camera Access Library or Camera Access Library by Canon (

Description: CALMAIN.exe is not essential for the Windows OS and causes relatively few problems. CALMAIN.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 96,370 bytes (43% of all occurrences), 96,341 bytes and 4 more variants. 
There is no information about the author of the file. The program is not visible. It is not a Windows system file. CALMAIN.exe is able to monitor applications. Therefore the technical security rating is 45% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can do the following:
  1) remove the entire program Canon Camera Access Library using Windows Control Panel
  2) ask for help from Support
  3) look for a new, improved version.

Recommended: Identify CALMAIN.exe related errors

Important: Some malware camouflages itself as CALMAIN.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the CALMAIN.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

As your Canon-camera is not connected to your PC all the time there is absolutely no reason to run this process always. Just start it when you want to connect the camera.
Part of Canon Camera Utilities
Part of the Canon digital utilities package. Not a problem, but tends to take up CPU & RAM. And Harry, Firefox loads just fine - you have a deeper problem.
app failure report in win 7/64
Installs with Canon digital camera software
\Program Files\Canon\CAL\CALMAIN.exe ; Canon Access Library 8 (Windows Service) ; Kameratreiber / Camera driver Canon
canon 400d
It's not working properly. Firefox will not start if it is loaded.
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of CALMAIN.exe: based on 23 votes with 9 reviews. 14 users think CALMAIN.exe is essential for Windows or an installed application. 6 users think it's probably harmless. 3 users think it's neither essential nor dangerous. 4 users don't grade CALMAIN.exe ("not sure about it").

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Best practices for resolving CALMAIN issues

A clean and tidy computer is the key requirement for avoiding problems with CALMAIN. 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.

To help you analyze the CALMAIN.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

CALMAIN.exe [all]