It may not seem too momentous, but a long awaited feature has finally been implemented. In BikeCAD version 20, double clicking a BCAD file will open that design in BikeCAD. On Windows, double clicking a second BCAD file will launch a second instance of BikeCAD. On MacOS, double clicking a second file will actually not do anything, so to open that second file, you'll have to use one of the other methods such as dragging the file into the BikeCAD window or selecting a new design from the File menu where we have various option including choosing one of our recently opened models.