The F (File) button enables image files to be linked that describe the configuration group, selection group, selection alternative or variable. The image formats that are supported are; JPEG, GIF and BMP.
By clicking on the symbol 
, the image file linked to the row on which the cursor is positioned is displayed in an area to the right of the selection group rows. You will find this symbol in the top right corner of the window. You can change the image size by dragging and clicking on the vertical and horizontal frame to the left and under the area where the image is displayed.
If an image file is linked, you will see an (#) on the F-button. You can delete a linked image file by selecting the button and clicking Delete on the keyboard.