an open it with Dynamo 1.X or 2.X, but if the file was created in Dynamo 2.X, you can only open it with Dynamo 2.X or greater).</p>

    <p>To check whether the file you are trying to open was created using Dynamo version 2.X, open the file using Notepad (or any other text editor on your computer) and check to see if the file looks similar to this example:</p>
    <!--images/MessageFailedToOpenCorruptedFile_image1.png--><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABBAAAAEnCAYAAAAQIrBCAAAMS2lDQ1BJ