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Leaseone
Participant
June 10, 2026
Question

I cant open Lightroom - System error - mfc140u.dll was not found. I looked online on how to fix it but nothing is working.

  • June 10, 2026
  • 1 reply
  • 16 views

I cant open Lightroom Classic -

System error - mfc140u.dll was not found.

I looked online on how to fix it but nothing is working.

    1 reply

    Rob_Cullen
    Community Expert
    Community Expert
    June 11, 2026

    The mfc140u.dll is part of Microsoft Visual Studio. Can I suggest that reinstalling the Visual C packages would restore mfc140u.dll for you.

    • In the Creative Cloud app, press CTRL + ALT + T (Win) to launch Creative Cloud Troubleshooter & select 'Close Creative Cloud and related processes' > click on Go.
    • Go to 'Add or Remove programs' in Windows, search & find all the installations of Microsoft Visual C++ Redistributable (all years).
    • Uninstall them completely. Even if there is an option to repair them, Uninstall all the existing MSVC++ packages.
    • Download a fresh package of Latest Supported installers for MSVC++ from this link: . 
    • https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist
    • Right-click the downloaded file and select Extract All.
    • Reinstall all packages (32bit & 64bit) & then restart the computer.
       
    Regards. My System: Windows-11, Lightroom-Classic 15.3, Photoshop 27.5, ACR 18.3, Lightroom 9.3, Lr-iOS 10.4.0, Bridge 16.0.3 .