PS: Get-SpecialPath

Get-SpecialPath.ps1

# STEP 0: Declare input parameter
Param([switch]$AsDrive)

# STEP 1: Define hash for paths
$csidl = @{
    "Personal" = 0x0005;
    "LocalAppData" = 0x001c;
    "InternetCache" = 0x0020;
    "Cookies" = 0x0021;
    "History" = 0x0022;
    "Windows" = 0x0024;
    "System" = 0x0025;
    "ProgramFiles" = 0x0026;
    "ProgramFilesx86" = 0x002a;
    "Profile" = 0x0028;
    "AdminTools" = 0x0030;
}

# STEP 2: Set up Shell.Application COM object
$sa = New-Object -ComObject Shell.Application

# STEP 3: Set up hask for paths, collect with "names"
$sp = @{} # the special paths collection
foreach($key in $csidl.keys)
{
    $sp[$key] = $sa.NameSpace($csidl[$key]).Self.Path;
}

# STEP 4: Map global drives using names from the hash
if($AsDrive) # Param declared at the beginning
{
    $keys = $sp.keys;
    $keys | %{
        $p = $sp[$_];
        if($p.Length -gt 0)
        {
            $n = $csidl[$_] # numeric to help ID the drive...
            New-PSDrive -Name: $_ -PSProvider:FileSystem -Root:$p `
                -Scope Global -Description:"SpecialFolder$n"
        }
    }
} else {
    return $sp;
}

# http://www.vistax64.com/powershell/19524-need-quick-way-get-my-documents-folder.html