Repair CNMUI.DLL DLL Issues (How to Download and Fix)

Last Updated: 11/24/2023
[Time to Read: ~3-5 minutes]

The development of Canon IJ Printer Driver by Canon Inc. prompted the latest creation of CNMUI.DLL. It is also known as a IJ Printer Interface Driver file (file extension DLL), which is classified as a type of Win64 DLL (Dynamic link library) file.

CNMUI.DLL was initially released with Canon Pixma MP250 1.04 on 09/19/2012 for the Windows 10 Operating System. According to our records, this release is the only version of this file offered by Canon Inc..

In this article, you will find detailed CNMUI.DLL information, a DLL file troubleshooting guide, and a list of versions that are available for free download.

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File Overview


General Information
File Name: CNMUI.DLL
File Extension: DLL file extension
Description: IJ Printer Interface Driver
Object File Type: Dynamic link library
File Operating System: Windows NT 32-bit
MIME Type: application/octet-stream
User Popularity Rating:
 
Developer and Software Information
Software Developer: CANON INC.
Software Program: Canon IJ Printer Driver
Legal Copyright: Copyright CANON INC. 2000-2010 All Rights Reserved
File Details
Character Set: Unicode
Language Code: English (U.S.)
File Flags: Pre-release
File Flags Mask: 0x003f
Entry Point: 0xd8524
Code Size: 913408


What are CNMUI.DLL Error Messages?


Dynamic Link Library CNMUI.DLL Errors

CNMUI.DLL is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like CNMUI.DLL, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. Canon Pixma MP250) could share the same CNMUI.DLL file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when CNMUI.DLL is attempted to be loaded either when Canon Pixma MP250 is starting up, or in some cases already running. Some of the most common CNMUI.DLL errors include:

Your CNMUI.DLL file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Canon Pixma MP250), or deleted by a malware infection. Furthermore, CNMUI.DLL file corruption could be caused from a power outage when loading Canon Pixma MP250, system crash while loading CNMUI.DLL, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix CNMUI.DLL Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your CNMUI.DLL issue. These troubleshooting steps are listed in the recommended order of execution.


Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the CNMUI.DLL error, please proceed to the Step 2 below.

Step 2: If recently installed Canon Pixma MP250 (or related software), uninstall then try reinstalling Canon Pixma MP250 software.

You can uninstall Canon Pixma MP250 software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for Canon Pixma MP250 1.04 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Canon Pixma MP250 software.

If this Step 2 fails as well, please proceed to the Step 3 below.

Canon Pixma MP250 1.04

Canon Inc.

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many CNMUI.DLL error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the CNMUI.DLL error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.



If Those Steps Fail: Download and Replace Your CNMUI.DLL File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate CNMUI.DLL file version. We maintain a comprehensive database of 100% malware-free CNMUI.DLL files for every applicable version of Canon Pixma MP250. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download CNMUI.DLL Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate Canon Pixma MP250 folder location:
    Windows 10: C:\Windows\System32\DriverStore\FileRepository\mp250p6.inf_amd64_4c193019582e375e\
  4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.


GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve CNMUI.DLL problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.



Download CNMUI.DLL Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying CNMUI.DLL to your appropriate Windows system directory. Canon Inc. typically does not release Canon Pixma MP250 DLL files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing CNMUI.DLL and all other DLL files for Canon Pixma MP250. An incorrectly installed DLL file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10


Files Related to CNMUI.DLL


DLL Files Related to CNMUI.DLL

File Name Description Software Program (Version) File Size (bytes) File Location
api-ms-win-core-namedp... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 11112 C:\Windows\inf\
IJInstNL.dll Canon IJ Driver Installer Canon IJ Driver Installer (1.6) 102400 C:\Windows\WinSxS\amd64_microsoft-windows-c..ri...
CNMPD9W.DLL IJ Print Processor Dispatcher Canon IJ Printer Driver (2.33.2.10) 28672 C:\Windows\SystemApps\Microsoft.Windows.CloudEx...
CNMSRRU.DLL IJ Status Monitor Canon IJ Printer Driver (2.33.2.10) 82944 C:\Windows\WinSxS\amd64_microsoft-windows-c..ri...
CNMLRTW.DLL IJ Language Monitor Canon IJ Printer Driver (2.33.2.10) 74752 C:\Windows\WinSxS\amd64_microsoft-windows-c..ri...

Other Files Related to CNMUI.DLL

File Name Description Software Program (Version) File Size (bytes) File Location
setupact.log Log Canon MP Navigator 5.0.2 24317 C:\Windows\System32\Sysprep\Panther\
setupact.log Log Canon Pixma MP250 1.04 14252 C:\Windows\System32\Sysprep\Panther\
setupact.log Log Canon Utilities PhotoStitch 3.1.6.8 17302 C:\Windows\System32\Sysprep\Panther\
WmiApRpl.ini Windows Initialization Canon Utilities PhotoStitch 3.1.6.8 29736 C:\Windows\inf\WmiApRpl\0009\
api-ms-win-core-profil... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 10600 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...


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