Copyright Goodheart-Willcox Co., Inc. Chapter 6 PLC Programming 113 Goodheart-Willcox Publisher Figure 6-35. How to select a report option in the Report Preview dialog box. To open an existing PLC program, click the Open File icon located on the toolbar. You can also click Open from the File menu. The Open/Import SLC 500 Program dialog box displays, Figure 6-36. From the Look In box, select the drive on which the program is located. Then, select the desired PLC project file and click Open. Goodheart-Willcox Publisher Figure 6-36. Open/Import dialog box.