Convert old ADM template to ADMX

I'm having an issue with an old ADM file that needs to be converted to ADMX.
I have no idea about what to do to accomplish this.

The ADM looks like this:

CLASS USER
CATEGORY !!WindowsComponents
 CATEGORY !!InternetExplorer
  CATEGORY !!InternetControlPanel
   CATEGORY !!SecurityPage
    CATEGORY !!InternetZone
     POLICY "Launching Applications and Unsafe Files"
      KEYNAME "Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3"
      EXPLAIN !!Launch
      PART 1806 DROPDOWNLIST REQUIRED
        VALUENAME "1806"
        ITEMLIST
	       NAME !!Enabled VALUE NUMERIC 0
	       NAME !!Prompt VALUE NUMERIC 1 DEFAULT
	       NAME !!Disabled VALUE NUMERIC 3
	END ITEMLIST
      END PART
     END POLICY
    END CATEGORY



    CATEGORY !!IntranetZone
     POLICY "Launching Applications and Unsafe Files"
      KEYNAME "Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1"
      EXPLAIN !!Launch
      PART 1806 DROPDOWNLIST REQUIRED
        VALUENAME "1806"
        ITEMLIST
	       NAME !!Enabled VALUE NUMERIC 0 DEFAULT
	       NAME !!Prompt VALUE NUMERIC 1 
	       NAME !!Disabled VALUE NUMERIC 3
	END ITEMLIST
      END PART
     END POLICY
    END CATEGORY




    CATEGORY !!TrustedSitesZone
     POLICY "Launching Applications and Unsafe Files"
      KEYNAME "Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2"
      EXPLAIN !!Launch
      PART 1806 DROPDOWNLIST REQUIRED
        VALUENAME "1806"
        ITEMLIST
	       NAME !!Enabled VALUE NUMERIC 0
	       NAME !!Prompt VALUE NUMERIC 1 DEFAULT
	       NAME !!Disabled VALUE NUMERIC 3
	END ITEMLIST
      END PART
     END POLICY
    END CATEGORY



    CATEGORY !!RestrictedSitesZone
     POLICY "Launching Applications and Unsafe Files"
      KEYNAME "Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4"
      EXPLAIN !!Launch
      PART 1806 DROPDOWNLIST REQUIRED
        VALUENAME "1806"
        ITEMLIST
	       NAME !!Enabled VALUE NUMERIC 0
	       NAME !!Prompt VALUE NUMERIC 1 
	       NAME !!Disabled VALUE NUMERIC 3 DEFAULT
	END ITEMLIST
      END PART
     END POLICY
    END CATEGORY



    CATEGORY !!LocalMachineZone
     POLICY "Launching Applications and Unsafe Files"
      KEYNAME "Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0"
      EXPLAIN !!Launch
      PART 1806 DROPDOWNLIST REQUIRED
        VALUENAME "1806"
        ITEMLIST
	       NAME !!Enabled VALUE NUMERIC 0 DEFAULT
	       NAME !!Prompt VALUE NUMERIC 1 
	       NAME !!Disabled VALUE NUMERIC 3
	END ITEMLIST
      END PART
     END POLICY
    END CATEGORY



   END CATEGORY
  END CATEGORY
 END CATEGORY
END CATEGORY

[strings]
WindowsComponents="Windows Components"
InternetExplorer="Internet Explorer"
InternetControlPanel="Internet Control Panel"
SecurityPage="Security Page"
InternetZone="Internet Zone"
IntranetZone="Intranet Zone"
TrustedSitesZone="Trusted Sites Zone"
RestrictedSitesZone="Restricted Sites Zone"
LocalMachineZone="Local Machine Zone"

Launch="This is a custom ADM template to manage the Internet Explorer setting Launching Applications and Unsafe Files using GPO-Administrative Policies."
Prompt="Prompt"
Enabled="Enabled"
Disabled="Disabled"

Select all Open in new window

The code is from this site: https://blogs.technet.microsoft.com/askperf/2007/11/27/managing-the-launching-applications-and-unsafe-files-setting/

Any help is appreciated.