A family of Microsoft word processing software products for creating web, email, and print documents.
Have you looked at the contents of the flash drive using Windows Explorer or the File Explorer.
If you can see the files in that way, copy them from the flash drive to a folder on your local (C:) drive and then use File>Open in Word and navigate to that folder and select the file that you want to open.
Do NOT try and open the files when they are located on the flash drive as corruption of the document is an almost certain result.