Wireless KeyView from Nirsoft Freeware is a free encryption software for Windows-based PCs.
It allows you to easily save all keys to text/html/xml file, or copy a single key to the clipboard.
You can also export your wireless keys into a file and import these keys into another computer.
Each time you introduce the password for the wireless internet connection at home or at work, Windows stores them.
It is very lightweight and easy to use so it’s worth a try to see if you’ll keep it in your utility belt.