$file=@ScriptDir&'\file.txt'
$text = FileRead($file)
$text=StringReplace($text, 'некоторый текст', '-webkit-border-radius:2px 0 0 2px;' & @CR & _
'background:#ff0000;'& @CR & _
'opacity:.85;')
$file = FileOpen($file,2)
FileWrite($file, $text)
FileClose($file)