How to fix a file extension back to the original file type

Question

I have a file that downloads as a .ast file extension. I mistakenly told Windows 11 to have it open in a embroidery design

application. I need to fix it so that it does not recognize the embroidery design application.

Answer 1

Hi,

To remove the file association for the .ast file type, please do the following:

Create a System Restore Point. Reference: System Protection | Microsoft Support

Then, open Command Prompt (admin) and type the following commands:

cmd.exe

assoc .ast

assoc .ast=

reg delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.ast" /f

Post the output here.