I got this information from some website through my normal search in Google. I thought sharing these information will be helpful for some to understand the basic idea of passwords stored in their computer.

Be aware that even if you know the location of the saved password, you cannot use the username / password as it may be encrypted with strong algorithm . Many applications store the passwords in a way that prevent you from moving them to another computer.
However, you can use this information to remove unwanted saved passwords from your system.

• Windows Network Passwords (XP/Vista/2003): When you connect to the file system of another computer on your network (something like \MyCompMyFolder), Windows allows you to save the password. If you choose to save the password, the encrypted password is stored in a credential file.
  The credential file is stored in the following locations:
  • Windows XP/2003: [Windows Profile]Application DataMicrosoftCredentials[User SID]Credentials and [Windows Profile]Local SettingsApplication DataMicrosoftCredentials[User SID]Credentials
  • Windows Vista: [Windows Profile]AppDataRoamingMicrosoftCredentials[Random ID] and [Windows Profile]AppDataLocalMicrosoftCredentials[Random ID]

Dialup/VPN Passwords (2000/XP/Vista/2003): Dialup/VPN passwords are stored as LSA secrets under HKEY_LOCAL_MACHINESecurityPolicySecrets. This key contains multiple sub-keys, and the sub-keys which store the dialup passwords contains one of the following strings: RasDefaultCredentials and RasDialParams.

This key is not accessible from RegEdit and other tools by default, but you can use one of the following methods to access this key:

• 1. Use at command to run RegEdit.exe as SYSTEM user: (doesn’t work under Vista)
     For Example:
     at 16:14 /interactive regedit.exe
  2. Change the permission of entire Security key. If you do that, it’s recommeneded to return the permissions back to the original after you finish.
• Internet Explorer 4.00 – 6.00: The passwords are stored in a secret location in the Registry known as the “Protected Storage”. The base key of the Protected Storage is located under the following key: “HKEY_CURRENT_USERSoftwareMicrosoftProtected Storage System Provider”. In order to view the subkeys of this key in RegEdit, you must do the same process as explained for the LSA secrets.
  Even when you browse the above key in the Registry Editor (RegEdit), you won’t be able to watch the passwords, because they are encrypted. Also, this key cannot easily moved from one computer to another, like you do with regular Registry keys.

• Internet Explorer 7.00 – 8.00: The new versions of Internet Explorer stores the passwords in 2 different locations. AutoComplete passwords are stored in the Registry under HKEY_CURRENT_USERSoftwareMicrosoftInternet ExplorerIntelliFormsStorage2. HTTP Authentication passwords are stored in the Credentials file under Documents and SettingsApplication DataMicrosoftCredentials , together with login passwords of LAN computers and other passwords.

• Firefox: The passwords are stored in one of the following filenames: signons.txt, signons2.txt, and signons3.txt (depends on Firefox version) These password files are located inside the profile folder of Firefox, in [Windows Profile]Application DataMozillaFirefoxProfiles[Profile Name] Also, key3.db, located in the same folder, is used for encryption/decription of the passwords.

• Google Chrome Web browser: The passwords are stored in [Windows Profile]Local SettingsApplication DataGoogleChromeUser DataDefaultWeb Data (This filename is SQLite database which contains encrypted passwords and other stuff)

• Opera: The passwords are stored in wand.dat filename, located under [Windows Profile]Application DataOperaOperaprofile

• Outlook Express (All Versions): The POP3/SMTP/IMAP passwords Outlook Express are also stored in the Protected Storage, like the passwords of old versions of Internet Explorer.

• Outlook 98/2000: Old versions of Outlook stored the POP3/SMTP/IMAP passwords in the Protected Storage, like the passwords of old versions of Internet Explorer.

• Outlook 2002-2008: All new versions of Outlook store the passwords in the same Registry key of the account settings. The accounts are stored in the Registry under HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfiles[Profile Name]9375CFF0413111d3B88A00104B2A6676[Account Index] If you use Outlook to connect an account on Exchange server, the password is stored in the Credentials file, together with login passwords of LAN computers.

• Windows Live Mail: All account settings, including the encrypted passwords, are stored in [Windows Profile]Local SettingsApplication DataMicrosoftWindows Live Mail[Account Name] The account filename is an xml file with .oeaccount extension.

• ThunderBird: The password file is located under [Windows Profile]Application DataThunderbirdProfiles[Profile Name] You should search a filename with .s extension.
• Google Talk: All account settings, including the encrypted passwords, are stored in the Registry under HKEY_CURRENT_USERSoftwareGoogleGoogle TalkAccounts[Account Name]
• Google Desktop: Email passwords are stored in the Registry under HKEY_CURRENT_USERSoftwareGoogleGoogle DesktopMailboxes[Account Name]

• MSN/Windows Messenger version 6.x and below: The passwords are stored in one of the following locations:
  1. Registry Key: HKEY_CURRENT_USERSoftwareMicrosoftMSNMessenger
  2. Registry Key: HKEY_CURRENT_USERSoftwareMicrosoftMessengerService
  3. In the Credentials file, with entry named as “Passport.Net\*”. (Only when the OS is XP or more)

• MSN Messenger version 7.x: The passwords are stored under HKEY_CURRENT_USERSoftwareMicrosoftIdentityCRLCreds[Account Name]

• Windows Live Messenger version 8.x/9.x: The passwords are stored in the Credentials file, with entry name begins with “WindowsLive:name=”.

• Yahoo Messenger 7.5 or later: The password is stored in the Registry, under HKEY_CURRENT_USERSoftwareYahooPager – “ETS” value. The value stored in “ETS” value cannot be recovered back to the original password.

• AIM Pro: The passwords are stored in the Registry, under HKEY_CURRENT_USERSoftwareAIMAIMPRO[Account Name]

• AIM 6.x: The passwords are stored in the Registry, under HKEY_CURRENT_USERSoftwareAmerica OnlineAIM6Passwords

• ICQ Lite 4.x/5.x/2003: The passwords are stored in the Registry, under HKEY_CURRENT_USERSoftwareMirabilisICQNewOwners[ICQ Number] (MainLocation value)

• ICQ 6.x: The password hash is stored in [Windows Profile]Application DataICQ[User Name]Owner.mdb (Access Database) (The password hash cannot be recovered back to the original password)

• Digsby: The main password of Digsby is stored in [Windows Profile]Application DataDigsbydigsby.dat All other passwords are stored in Digsby servers.

• PaltalkScene: The passwords are stored in the Registry, under HKEY_CURRENT_USERSoftwarePaltalk[Account Name].

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