If you regularly use Explorer’s Details view, here’s a convenient keyboard shortcut you should know about. After opening an Explorer window in Details view, hold down the Ctrl key and press the Plus (+) key on the numeric keypad. This shortcut instantly and automatically resizes each column based on the width of the longest entry in that column, so you can see all the file details.
Tip of the day: Automatically resize columns in Windows Explorer
Published
Ed Bott 
Very nice. If only there was a keyboard shortcut for switching to the List View of files, the one I use most often, then I’d be ecstatic.
There’s no single shortcut that will do the trick, but will you settle for a two-key combination? Alt+V, L switches to List view in any Explorer window.
Thanks for this, thats one of those little tricks that makes a heavy keyboarder’s life much easier, keep those obscure keystrokes coming.
Ed, that’s TWICE the work. Those extended keyboard shortcuts like that forced George Jetson into early retirement!
Now if only there was a keyboard shortcut to do this with an excel spreadsheet.
Hold down Alt and type OCA. Because the Alt button allows you to flick through all the menu options then you can create your own keyboard shortcut for pretty much anything.
In response to Zaine, this may require three button presses, but if it happens to be a function your perform regularly then it sure is a lot faster than the mouse.