This file is part of Microsoft’sMedia Foundation Platform.
Not all versions of Windows have this installed, which is one reason the file might be missing.
How to Fix Mfplat.dll Errors
Don’t download mfplat.dll from a “DLL download” website.

There are many reasons whydownloading a DLL file is a bad idea.
Restore mfplat.dll from the Recycle Bin.
The easiest possible cause of a “missing” mfplat.dll file is that you’ve mistakenly deleted it.
set up the Media Feature pack from Microsoftto restore the missing mfplat.dll file.
Windows N versions don’t include the media pack by default and therefore require a manual installation of it.
There are two download links to pick from.
Try your best to complete this step.
Run a virus/malware scan of your entire system.
Use System Restore to undo recent system changes.
trigger the sfc /scannow System File Checker commandto replace a missing or corrupt copy of the mfplat.dll file.
If this file is provided by Microsoft in your version of Windows, theSystem File Checkertool should restore it.
Reinstall the program that uses the mfplat.dll file.
If the error happens when you use a particular program, reinstalling the program should replace the file.
Update the drivers for hardware devicesthat might be related to mfplat.dll.
This file may or may not be related to video cardsthis was just an example.
The key here is to pay very close attention to the context of the error and troubleshoot accordingly.
Install any available Windows updates.
Manyservice packsand otherpatchesreplace or update some of the hundreds of Microsoft-distributed DLL files on your setup.
The mfplat.dll file could be included in one of those updates.
Test your memoryand thentest your hard drive.
If the hardware fails any of your tests,replace the memoryorreplace the hard drive.
Repair your installation of Windows.
Use a free registry cleanerto repair mfplat.dll related issues in the registry.
Perform a clean installation of Windows.
This erases everything from thehard driveand installs a fresh copy of Windows.
If none of the steps above correct the mfplat.dll error, this should be your next course of action.
All the information on your hard drive will be erased during a clean install.
Troubleshoot for a hardware problemif any mfplat.dll errors persist.
After a clean install of Windows, your DLL problem can only be hardware related.
There are several ways these DLL errors can show up on your system.
The context of the error is an important piece of information that will be helpful while solving the problem.