When I double click on a ChemDraw file, ChemDraw Net launches, instead of my copy of ChemDraw Pro or Std.
The Net version has a newer creation date than the Pro and Std versions, which is why it launches when double clicking on a ChemDraw file. Remove the Net version. If you have a full version, you don't need it. All of the features and capabilities of the Net versions are available in our Pro and Std versions.