If you have files that you use often, you can pin them to the Windows Start menu or the Pinned list in Word, Excel, or PowerPoint so you can get to them quickly.
From any file, tap File > Open.
In the list of files, tap the down arrow next to the file you’d like to pin.
Choose an option:
NOTE If you open an app, and haven’t opened a file yet, you can still pin files. From the New screen that appears when you first open an app, tap the down arrow next to the file you’d like to pin and choose Pin to Start or Pin to list.
Unpin a file