org.openscience.cdk.exception.CDKException: Could not determine file format
at org.openscience.jchempaint.io.FileHandler.createReader(FileHandler.java:113)
at org.openscience.jchempaint.application.JChemPaint.readFromFileReader(JChemPaint.java:281)
at org.openscience.jchempaint.action.OpenAction.actionPerformed(OpenAction.java:103)