How to "open a read-only" PowerPoint presentation in PowerPoint2013

1, the left mouse button double-click the computer Desktop PowerPoint 2013 Presentation program icon, open it to run. In the Open PowerPoint 2013 Program window, click the Open Other Presentation option on the left pane. As shown in the picture;

2, in the jump to the open page, click the "Computer"--> "browse" option command. As shown in the picture;

3, then in the Open dialog box, find the directory where the PPT presentation, the ppt file selected. As shown in the picture;

4, after the ppt file selected, and then click the "Open" button next to the Drop-down button. As shown in the picture;

5, click the Drop-down button, in the Pop-up list menu select the "read-only Open (R)" option click it. As shown in the picture;

6. Go back to the PowerPoint editing window and see that our current file is open in Protected View on the title bar. As shown in the picture;