A file extension cannot be associated with an application under Windows 7/8/10

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If you cannot assign a file extension to an application under Windows 7/8/10, you should try this :

Unable to assign a file extension

June 2020 Update:

We now recommend using this tool for your error. Additionally, this tool fixes common computer errors, protects you against file loss, malware, hardware failures and optimizes your PC for maximum performance. You can fix your PC problems quickly and prevent others from happening with this software:

  • Step 1 : Download PC Repair & Optimizer Tool (Windows 10, 8, 7, XP, Vista – Microsoft Gold Certified).
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and navigate to:


Here you will find the command. . exe name that causes problems

Expand and navigate to :

Shell > Open > Command.

double-click it and make sure that the application location points to the actual location of the executable file in the value data field.

Exit the registry editor.

Now link the file type for this special extension and see if it helps!

Our Freeware File Association Fixer for Windows should also interest some of you. This article shows you how to reset all file associations in Windows 10 to default settings.

RECOMMENDED: Click here to troubleshoot Windows errors and optimize system performance

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