Choose the This PC option from the Open File Explorer to drop down menu. As helpful as it may be to get File Explorer to display This PC by default, there is one more trick that I want to show you.

Use the Downloads area of the browser's settings to change Chrome's download location. Select Change to pick which folder ...

Going through the same menu for every file is a waste of your time, so instead set up Firefox to download RAR files to the same folder every time without asking.