The recovered file does not contain my changes.

The amount of new information that the recovered file contains depends on how frequently a Microsoft Office program saves the recovery file. For example, if the recovery file is saved only every 15 minutes, your recovered file won't contain your last 14 minutes of work before the power failure or similar problem occurred. To change the AutoRecover save interval, enter a number in the minutes box on the Save tab in the Options dialog box (Tools menu).