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By landing on this page you are most probably trying to download the Mfc100u.dll DLL file to get rid of the error:

Windows Error - Mfc100u.dll

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Unable to start program due to Mfc100u.dll being missing from your computer. Try reinstalling the program to fix the problem.

On this page, I have laid out the information you will need to know to understand what is causing this error as well as the versions of Mfc100u.dll which are sorted by age and type of operating system.

What is the Mfc100u.dll file?

The Mfc100u.dll file is a dynamic link library used across multiple Adobe programs that were once originally created by Macromedia.

If you are trying to use Flash, Dreamweaver or any of the other desktop publishing programs from the two developers then you could require this file.

These programs have been the backbone of the online for years and this library contains the logic required to visualize webpages and Flash player content on your Windows-based computer.

On your system, you may find many Adobe branded DLLs such as Adbeape.dll, AXE8SharedExpat.dll, AfterFXLib.dll and FlashUtil_ActiveX.dll.

Some game franchises also require that this DLL file be working including various Batman, Battlefield, Grand Theft Auto and Crash Bandicoot titles.

Why do I need this file?

Without the file present and up to date in the correct location, your Adobe/Macromedia programs will refuse to launch and throw an error up on the screen.

Chances are that if you are here then you have experienced the error that Mfc100u.dll is missing and so you are looking for a copy of that file.

Before downloading a new copy of the file try simply restarting your computer first, it may kick the registry into updating the file’s location and allow the programs to reference it.

If that doesn’t seem to fix the error then try reinstalling the programs that are failing to start from CD/DVD or downloaded file.

By forcing a new install the process may go out and fetch the DLL again and place it in the location that it wishes it to be.

Why is the Mfc100u.dll is missing error appearing?

A common cause of this error is that the company you have bought your PC from has forgotten to install the library.

On the other hand, if you have an older computer then it could be a sign of a more sinister issue in the form of a hardware or software fault.

A worst-case scenario is that you may have a virus lurking on your computer that is deleting important files and libraries to cause the user pain or even hold you to ransom.

The first and easiest solution to this issue is to re-install the Mfc100u.dll library from this page, then if unsuccessful try a new anti-virus program.

How do you fix the problem?

The simplest solution to fix the “Mfc100u.dll is missing” error and download the appropriate DLL file listed below.

After you have chosen the correct file and the download has finished you will need to put it in the target folder, as the warning message will let you know.

If you do not feel you are able to perform this task then you can download software that will try to automatically fix this for you by following these steps:

Method 1: (DIY) download/install DLL yourself

Underneath this block of text are the versions of the Mfc100u.dll that we have found and cataloged, choose the right version for your system then download and install.

Mfc100u.dll, available versions:

32/64 Bit (includes most recent)Auto FixU.S. English Download
64 Bit 10.0.40219.325MFCDLL Shared Library - Retail VersionU.S. English Download
32 Bit 10.0.40219.325MFCDLL Shared Library - Retail VersionU.S. English Download
32 Bit 10.0.30319.1MFCDLL Shared Library - Retail VersionU.S. English Download

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Which version of Mfc100u.dll do I choose?

Ideally, you will want to choose the most recent (highest version number) DLL file with the correct 32 or 64-bit label for your system.

Choosing a 64-bit version of the file will help ensure that your system can take advantage of the faster processing power available in your PC.

Where should I place the DLL once downloaded?

First, try placing the file into the folder where the program you are having problems with lives.

Usually, if you have an error telling you that this file is missing it will tell you where it is missing from.

What if I need to register the Mfc100u.dll file?

Once you have attempted the simplest solution of placing the DLL file into the target folder and found it hasn’t worked then you may have to register the change with Windows.

To do this you can save the DLL file to the C:WindowsSystem32 folder and then open a command prompt using admin rights, type “regsvr32 Mfc100u.dll” and run it.

Method 2: (Auto) Have a program do it for you

A program exists that will take the hard work out of fixing your missing Mfc100u.dll file problem called Auslogics.

The Auslogics suite of programs can keep your computer ticking by and ensure that the drivers and DLL files remain in working order.


See more information about Outbyte and uninstall instructions. Please review the Outbyte EULA and Privacy Policy

Click "Download Solution" to get the PC tool that comes with Mfc100u.dll. The utility will automatically determine missing dlls and offer to install them automatically. Being an easy-to-use utility, it is a great alternative to manual installation, which has been recognized by many computer experts and computer magazines. Limitations: trial version offers an unlimited number of scans, backup, restore of your windows registry for FREE. Full version must be purchased.

It supports such operating systems as Windows 10, Windows 8 / 8.1, Windows 7 and Windows Vista (64/32 bit). File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

Method 3: (Semi-Auto) Use the system checker built-in admin tool to find a fix

Those familiar with the Windows operating system will know of the sfc/scannow file integrity check for important files.

You can run this tool by doing the following:

  • Start by launching the command line as an administrator (right-click to find the option) that you find in the search field using the keywords “command prompt”.
  • In the newly launched window enter “sfc / scannow” without the quotes and hit the enter key to run the command.
  • Now the program should launch and start working without any further input.
  • You will know when the program has finished running and has been successful when a dialog appears saying “Windows Resource Protection found corrupt files and successfully repaired them.”.

Hopefully, the system checker will notice that the Mfc100u.dll file is missing and automatically fix it for you.

Method 4: (Anti-Virus) Install a new anti-virus and see if that can find and fix the problem

If you have been using your computer for a while and noticed that the Mfc100u.dll file has disappeared randomly while it has worked before then this can be a sign of malware.

A malicious piece of software could have deleted it in order to cause mayhem or maybe to hold you ransom for a payment to fix it.

The simplest fix would be for you to use the anti-virus built into the operating system called Windows Defender.

Method 5: (Restore) Restore your system to a time before the problems began

Like rolling back the clock and traveling back in time, the System Restore process built into various Windows versions allows you to roll your computer back to a time when it worked fully.

This is useful if you have problems such as a missing Mfc100u.dll file on your system and don’t know how it was lost.

You can attempt this yourself very easily by doing the following:

  • Open the Start menu and launch the “Run” program by searching for it.
  • With the “Run” program waiting for a command enter “rstrui” without the quotes and hit enter to open the system recovery tool.
  • With the system recovery tool open you can choose a restore point to roll back to when you believe the computer was safe and worked fully.

Now when you fire your computer up again you will be able to find out if you went far back enough to when the Mfc100u.dll error did not appear.

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