Powershell: Get a List of Registry Key Values

This code shows you how to acquire a list of value names after specifying a key path:

param
(
    [Parameter(Mandatory=$True)]
    [string]$Subkey,
    [Parameter(Mandatory=$True)]
    [string]$Filter
)

    $regkey = [Microsoft.Win32.Registry]::ClassesRoot
    if($Subkey)
    {
        $Names = $regkey.GetSubKeyNames()
        $NameList = New-Object 'System.Collections.Generic.List[string]'
       
        foreach($n in $Names)
        {
            $pos = $n.IndexOf($Filter)
           
            if ($pos -ne -1)
            {
                write-host $n  
                $NameList.Add($n)
        }   
        }     
    }
    else
    {
        $Names = $regkey.OpenSubKey($Subkey).GetSubKeyNames()
        $NameList = New-Object 'System.Collections.Generic.List[string]'
        foreach($n in $Names)
        {
            $pos = $n.IndexOf($Filter)
            if ($pos -gt 0)
            {
                write-output $n
                $NameList.Add($n)
        }   
        }
    }