What is CmdLineExt.dll?

The genuine CmdLineExt.dll file is a software component of SecuROM Shell Extension by Sony DADC Austria.
“CmdLineExt.dll” is a dynamic link library file that resides in Windows, known as ‘SecuROM context menu for Explorer’ and is part of the Sony SecuROM Copy Protection program, which is a Digital Rights Management (DRM) system by Sony DADC Austria AG for sellable content through CD-ROMs, DVD-ROMs, and digital products. The file is a shell extension that is added when a program with SecuROM is installed. It serves a validation process on software to ensure program legitimacy and it is customizable by the developer of the program as what protection elements are included, such as installation medium validation, license validation during installs, validity checks upon startup, etc. Sony DADC Austria AG is a division of Sony Corporation in Austria that provides digital and media (DVD, Blu-ray, etc.) entertainment solutions such as disc distribution services like SecuROM and production services. DADC stands for Digital Audio Disc Corporation.

cmdlineext stands for command line extension

CmdLineExt.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if CmdLineExt.dll is a Windows system file or if it belongs to an application that you can trust.

Click to Run a Free Scan for CmdLineExt.dll related errors

CmdLineExt.dll file information

The process known as SecuROM context menu for Explorer belongs to software SecuROM Shell Extension or Supreme Commander by Sony DADC Austria AG (

Description: CmdLineExt.dll is not essential for Windows and will often cause problems. The file CmdLineExt.dll is located in the C:\Windows\System32 folder or sometimes in a subfolder of the user's profile folder or in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 107,888 bytes (44% of all occurrences), 98,304 bytes, 108,144 bytes or 90,112 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The file is a file with no information about its developer. The program has no visible window. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. CmdLineExt.dll is not a Windows system file. The file has a digital signature. The CmdLineExt.dll file is a Verisign signed file. Therefore the technical security rating is 61% dangerous; however you should also read the user reviews.

Uninstalling this variant: If you have any problems with CmdLineExt.dll, you can completely remove SecuROM Shell Extension (Control Panel ⇒ Uninstall a Program) or contact to assist you.

Recommended: Identify CmdLineExt.dll related errors

Important: Some malware camouflages itself as CmdLineExt.dll. Therefore, you should check the CmdLineExt.dll 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

Causes Windows explorer to not repond. When I disabled it WE came back as desired....but.... now Call of Duty IV does not work
  Bill Barnes  
apparently installed with ALL EA games. had this problem with F.E.A.R. and SW:TOR.
Crashes your Windows Explorer, when you right click your mouse. Not sure where i got it from, but I disabled it with ShellExView and ive had no problems since..
Sony SecuROM file which will cause a ton of slowdown, disables ATi/AMD video card functions, and causes explorer crashes to the point where the computer becomes almost unusable.
I am an accountant and I have recently installed GRID (racing game) on my Windows Vista PC. After the installation, the initialisation of one of my accounting packages caused Windows Explorer to malfunction. I downloaded and installed ShellExView and in this way determined that this Shell Extension was the cause of the problem.
  Janco Kotze   (further information)
It is made by Sony DADC Austia AG. And it seems to crash windows explorer when rightclick on a .exe file. If you run ShellExView and disable the dll, then my computer doesn't crash while rightclick an .exe file in explorer. The link is in dutch.
  Molshoop   (further information)
Crashes my Explorer.exe on my Windows 7 when using Context Menu.
Causes crashes in Windows Explorer
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of CmdLineExt.dll: based on 31 votes with 9 reviews. 5 users think CmdLineExt.dll is essential for Windows or an installed application. 2 users think it's probably harmless. 8 users think it's neither essential nor dangerous. 4 users suspect danger. 12 users think CmdLineExt.dll is dangerous and recommend removing it. 9 users don't grade CmdLineExt.dll ("not sure about it").

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Best practices for resolving CmdLineExt issues

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

CmdLineExt.dll [all]