Why can’t I open all borehole .GEF file in the GEFPlotTool?

It is possible that the GEFPlotTool produces an error message. This may happen, for example, if the gef file belongs to a image file (.tiff) that was included in the delivery. Such gef file does not contain information for the GEFPlotTool to plot as a curve. For more information on the GEFPlotTool, click here.
An alternative is available with which gef files of drilling scan be opened: Boris & Profiler (in Dutch).