If you ever find yourself in a sticky wicket and need to extract usernames and passwords from Credential Manager (usually because you forgot them), you can use this handy-dandy little function from PowerShell:
function ExportCredMan
{
# Dump local passwords from credential manager
[void][Windows.Security.Credentials.PasswordVault, Windows.Security.Credentials, ContentType = WindowsRuntime]
$vault = New-Object Windows.Security.Credentials.PasswordVault
$allpass = $vault.RetrieveAll() | % { $_.RetrievePassword(); $_ }
$Output = "CachedPass.csv"
$allpass | Export-Csv -NoTypeInformation $env:TEMP\$Output
}
$TEMP\CachedPass.csv will contain all of the sites, usernames, and passwords stored in Credential Manager.
Cheers!

