on open (fileList)
	tell application "Finder"
		set myFile to item 1 of fileList
		if kind of myFile is not "folder" then display dialog ¬
			"file creator: " & (the creator type of (myFile as alias)) & return & ¬
			"file type: " & (the file type of (myFile as alias))
	end tell
end open

Displays the file type and file creator designations for any Mac OS document or application.

Get Mac File Type & Creator

file, mac, script

AppleScript