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property steam_id : "8930" --ここに起動したいSteamアプリのIDを入力

if runningProcess("Steam") then
	open location "steam://rungameid/" & steam_id
else
	do shell script "open /Applications/Steam.app --args -start steam://rungameid/" & steam_id
end if

on runningProcess(appName) --return true or false
	
	tell application "System Events"
		
		if application process appName exists then
			return true
		else
			return false
		end if
		
	end tell
	
end runningProcess