In Windows 8 and 8.1 there is no way to see the key of a wireless netoword form the GUI. In order to do so you must use an elevated command prompt.
To open an elevated command promt, just press the WINDOWS and X keys together and then click on Command Prompt (Admin). Click Yes to the User Account Control message that appears.
To show all wireless profiles on the PC at the command prompt, type:
netsh wlan show profiles
To show the security key at the command prompt, type:
netsh wlan show profile name=“ProfileName” key=clear
Pantelis Apostolidis is a Solutions Architect professional at Office Line SA and a recognized Microsoft Azure MVP. For the last 10 years, Pantelis has been involved to major cloud projects in Greece and abroad, helping companies to adopt and deploy cloud technologies, driving business value. He is entitled to a lot of Microsoft Expert Certifications, demonstrating his proven experience in delivering high quality solutions. He is an author, blogger and he is acting as a spokesperson for conferences, workshops and webinars. He is also an active member of several communities as a moderator in azureheads.gr and autoexec.gr. Follow him on Twitter @papostolidis.