Loading a file is pretty simple, but essential if you are working on a project that you need to interrupt or make changes to:
Loading a file is very similar to saving one. You've made changes in the one you were working on. Save it to a different name from the first file you saved.
Select File and then choose Open from the drop-down menu. The File Browser opens and, as you roll the mouse over the files, the one you are over is highlighted. Find Two 3D Views.blend.
Press theLMB to select it. Click theLMB on Open Blender File as shown in the following screenshot: