Yes, there is. Click right mouse button on file, choose Properties and then select "Yes" for "Excluded From Build".
But there is better option - add only Win32Handmade.cpp to project (remove all other files) and then select "Show All Files" button in solution explorer (8th from left).
Then Solution Explorer will show all files in folder instead of only those which are added to project. So you won't need to add anything else to project.