on open these_items 
	set tid to AppleScript's text item delimiters 
	repeat with i from 1 to the count of these_items 
		try 
			set TheFile to quoted form of POSIX path of ((item i of these_items) as alias) 
			set AppleScript's text item delimiters to ":" 
			 
			--der Eintrag unter IPTC:Caption-Abstract eigelesen und in eine Variable gespeichert 
			set TheIPTCCaption to text item -1 of (do shell script "exiftool -IPTC:Caption-Abstract " & TheFile) 
			 
			--Inhalt der Variable wird in IPTC:keywords geschrieben 
			do shell script "exiftool -IPTC:Keywords=" & quoted form of TheIPTCCaption & " " & TheFile 
		on error 
			display dialog "Fehler beim bearbeiten: " & TheFile 
		end try 
	end repeat 
	set AppleScript's text item delimiters to tid 
end open 

do shell script "exiftool -a -u -g1 " & quoted form of POSIX path of (choose file)