Ever forgotten your own wireless network key or been to visit a client who doesn’t remember theirs? If so, this small free utility called WirelessKeyView allows you to view saved wireless network keys in plain text.
This tool can retrieve both WEP and WPA wireless network keys and even allow you to output the results to HTML so you can save or print them out. This tool is a must have for any technician supporting wireless networks for clients.
Screenshot:

Downloads:
Download at Official Site

Articles
Blogs
Kits
Forums
Good tool, but as most people user WPA rather than WEP it has it’s limitations.
This tool can read WPA as well as WEP. WEP was just used in this screenshot for example purposes. Whats the limitation that you discovered?
Checked via VirusTotal.com
Loaded with viruses!!!!
==============================
Antivirus Version Last Update Result
a-squared 4.5.0.24 2009.09.27 Riskware.PSWTool.Win32.Messen!IK
AhnLab-V3 5.0.0.2 2009.09.26 -
AntiVir 7.9.1.27 2009.09.28 SPR/PSW.Messen.CW
Antiy-AVL 2.0.3.7 2009.09.27 -
Authentium 5.1.2.4 2009.09.27 -
Avast 4.8.1351.0 2009.09.27 -
AVG 8.5.0.412 2009.09.27 -
BitDefender 7.2 2009.09.28 Gen:Application.Heur.cmKfbi9YXt
CAT-QuickHeal 10.00 2009.09.26 PSWTool.Messen.cw (Not a Virus)
ClamAV 0.94.1 2009.09.27 -
Comodo 2456 2009.09.28 UnclassifiedMalware
DrWeb 5.0.0.12182 2009.09.28 -
eSafe 7.0.17.0 2009.09.24 Win32.HackerToolMess
eTrust-Vet 31.6.6763 2009.09.27 -
F-Prot 4.5.1.85 2009.09.27 -
F-Secure 8.0.14470.0 2009.09.28 PSWTool.Win32.Messen.cw
Fortinet 3.120.0.0 2009.09.27 HackerTool/Messen
GData 19 2009.09.28 Gen:Application.Heur.cmKfbi9YXt
Ikarus T3.1.1.72.0 2009.09.27 not-a-virus:PSWTool.Win32.Messen
Jiangmin 11.0.800 2009.09.27 -
K7AntiVirus 7.10.855 2009.09.26 not-a-virus:PSWTool.Win32.Messen.cw
Kaspersky 7.0.0.125 2009.09.28 not-a-virus:PSWTool.Win32.Messen.cw
McAfee 5754 2009.09.27 potentially unwanted program Tool-WirelessKeyView
McAfee+Artemis 5754 2009.09.27 potentially unwanted program Tool-WirelessKeyView
McAfee-GW-Edition 6.8.5 2009.09.28 Riskware.PSW.Messen.CW
Microsoft 1.5005 2009.09.23 -
NOD32 4462 2009.09.27 Win32/WirelessKeyView.A
Norman 6.01.09 2009.09.26 -
nProtect 2009.1.8.0 2009.09.27 -
Panda 10.0.2.2 2009.09.27 Suspicious file
PCTools 4.4.2.0 2009.09.27 -
Prevx 3.0 2009.09.28 -
Rising 21.48.62.00 2009.09.27 -
Sophos 4.45.0 2009.09.28 NirSoft
Sunbelt 3.2.1858.2 2009.09.27 -
Symantec 1.4.4.12 2009.09.28 -
TheHacker 6.5.0.2.019 2009.09.26 Trojan/Messen.cw
TrendMicro 8.950.0.1094 2009.09.25 -
VBA32 3.12.10.11 2009.09.27 -
ViRobot 2009.9.26.1958 2009.09.26 Not_a_virus:PSWTool.Messen.46080.A
VirusBuster 4.6.5.0 2009.09.27 -
Sky, because it is designed to uncover passwords, something which viruses can do, its marked as malicous by some companies. This is a false positive.