Missing MFC140U.DLL Error

Covers an issue caused by a missing DLL file that prevents Well Seeker from opening.


When attempting to open Well Seeker Pro, the user receives the following error message:


The MFC140U.DLL file is part of the Visual C++ Redistributable package for Microsoft Visual Studio. If this package is not installed on the user’s computer, they will get the above error. This issue is often seen just after installing the software on a new computer.


To solve this issue, the user must download and install the Visual C++ Redistributable package for Microsoft Visual Studio.

First make sure that your Windows operating system is up to date. This may automatically install the package. To update Windows, follow these steps:

  1. Press the Windows key and search for ‘windows update settings.’ Click on Windows Update Settings under Best Match.

  1. In the Windows Update dialog, click on Check For Updates. Follow the instructions to download and install any available updates. You may be required to restart your computer before the installation of all updates is complete.

If this does not download the package, you will need to download it manually. To do so, follow these steps:

  1. Scroll down to Visual Studio 2015, 2017, 2019 and 2022. Click on the two links highlighted in the image below to download both the x64 and x86 versions of the package to your computer.

  1. Run vc_redist.x86.exe and vc_resdist.x64.exe to install the package on your computer. After installation is complete, restart your computer.

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