You can try to take a look the below ADM template:
Code:
CLASS USER
CATEGORY "Windows Explorer Customization"
POLICY "Show file extensions of known file types"
KEYNAME "Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced"
VALUENAME "HideFileExt"
VALUEON NUMERIC 0
VALUEOFF NUMERIC 1
END POLICY
END CATEGORY
Just copy it into a notepad and save it with the extension .ADM. After that import it into the Group Policy Editor. Ensure to right click the category "Windows Explorer Customization" first and then select "View > Filtering and uncheck all "Only show" boxes.
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