I can highly recommend altap salamander. It's an incredibly useful two panel file manager. You can switch between detail view and a big picture preview with alt+3 and alt+5. You can select folders/files with space, and in case of folders it will also show you the total file size of that folder. It has icons for available drives in a toolbar, and you can configure the F4 key so that it opens the focused file with an editor of your choice, notepad++ in my case.