Not all must have used this feature of Vim, You can use Vim’s file browsing feature, to select and open a file all you need to do is know a “vsp” command.
To the “vsp” or the Vertical Split command give argument as “.”, a period. Which will prompt Vim to open left bar that will list all directories and files, directories first, just like any directory listing command of your OS.
You can traverse the directories by pressing “Enter” to change to that directory, and you can go on browsing.
If you want to open a file, Press “o” when the cursor is under that file. That will open the file in the same window as the Browser window.
If you want to open the file in the previously visited window, press “O” (Captial alphabet O). This will open the file in the previous window.
Now you know how to use Vim as your favourite GUI Editor 🙂