PSv6> $s = New-Object -ComObject "Shell.Application"
PSv6> $w = $s.Windows()
PSv6> $w.Count
1
PSv6> $w  ## dump $w, and powershell should enumerate $w to unwrap the collection

Application          : System.__ComObject
Parent               : System.__ComObject
Container            :
Document             : System.__ComObject
TopLevelContainer    : True
Type                 :
Left                 : -32000
Top                  : -32000
Width                : 160
Height               : 28
LocationName         : 6.0.0-beta1
LocationURL          : file:///D:/PowerShell/6.0.0-beta1
Busy                 : False
Name                 : File Explorer
HWND                 : 923136
FullName             : C:\WINDOWS\Explorer.EXE
Path                 : C:\WINDOWS\
Visible              : True
StatusBar            : False
StatusText           :
ToolBar              : 1
MenuBar              : False
FullScreen           : False
ReadyState           : 4
Offline              : False
Silent               : False
RegisterAsBrowser    : False
RegisterAsDropTarget : True
TheaterMode          : False
AddressBar           : True
Resizable            : True

Count
-----
    2

PSv6> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      6.0.0-beta
PSEdition                      Core
BuildVersion                   3.0.0.0
CLRVersion
GitCommitId                    v6.0.0-beta.1
OS                             Microsoft Windows 10.0.15063
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

PSv6>  $w._NewEnum()
An error occurred while enumerating through a collection: Could not load type 'System.Runtime.InteropServices.ComTypes.IEnumerator' from assembly 'System.Private.CoreLib, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=7cec85d7bea7798e'..
At line:1 char:2
+  $w._NewEnum()
+  ~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.__ComObject:__ComObject) [], RuntimeException
    + FullyQualifiedErrorId : BadEnumeration