Save as txt.reg and execute it.

create-txt.reg

Windows Registry Editor Version 5.00
 
; clear the key
[-HKEY_CLASSES_ROOT\.txt]
 
; and recreate
[HKEY_CLASSES_ROOT\.txt]
"PerceivedType"="text"
@="txtfile"
"Content Type"="text/plain"
 
[HKEY_CLASSES_ROOT\.txt\ShellNew]
; @C:\Windows\system32\notepad.exe,-470
"ItemName"=hex(2):40,00,43,00,3a,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,\
  73,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6e,00,6f,\
  00,74,00,65,00,70,00,61,00,64,00,2e,00,65,00,78,00,65,00,2c,00,2d,00,34,00,\
  37,00,30,00,00,00
"NullFile"=""

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