This button on the toolbar starts the ASCII editor (configured in EFDC_Explorer Settings) and directly loads certain input files for the current project. From the drop down window the user can directly access the input files: EFDC.INP, DXDY.INP, LXLY.INP, CELL.INP, WQ3DWC.INP, WQPSL.INP or WQ3DSD.INP. In addition, the user can select "Other INP" to access any of the input files in the current project.