use framework "Foundation"
use AppleScript version "2.4"
use scripting additions

property NSThread : class "NSThread"
property NSOpenPanel : class "NSOpenPanel"

if not (current application's NSThread's isMainThread()) as boolean then
	display alert "This script must be run from the main thread using ^â  +R." buttons {"Cancel"} as critical
	error number -128
end if

set op to NSOpenPanel's openPanel()
tell op
	its setMessage:"Flying on your Desktop"
	its setFloatingPanel:true -- floats on top of all other windows
	its setAllowedFileTypes:["com.adobe.pdf"]
end tell

if (op's runModal() = (current application's NSFileHandlingPanelOKButton)) then
	display dialog (op's URLs()) as text
end if
return