powershell - Only copy certain file types after unzipping -

i have following code unzip many folders in directory tree:

new-item e:\files -type directory  get-childitem -path e:\snl_insurance\* -recurse -exclude "*.md5" |  foreach-object {      $file = $_     write-host $file;     $destination = "e:\files"     $shell = new-object -com shell.application     $zip = $shell.namespace($file.fullname)       foreach($item in $zip.items()){          if ($item.name -eq ".txt") {             $shell.namespace($destination).copyhere($item)         }     }  } 

without if statement script copies zip files on too, not text files contained beneath. thought check make sure file extension .txt (or *.txt ive tried both) $item.name doesn't seem contain thought did. if have ideas and/or can explain $shell variable here (and $shell.namespace helpful) in advance.

edit: responses. found way before saw these answers. here solution found if interested:

new-item e:\files -type directory  get-childitem -path e:\snl_insurance\insurance\* -recurse -exclude "*.md5"|  foreach-object {      if ($_.extension -eq ".zip") {         get-childitem -path $_ -recurse|               foreach-object {                      $file = $_                     write-host $file;                     $destination = "e:\files"                     $shell = new-object -com shell.application                     $zip = $shell.namespace($file.fullname)                       foreach($item in $zip.items()){                          $shell.namespace($destination).copyhere($item)                      }              }              } } 

to copy text files can use:

foreach($item in $zip.items()){ if ($item.type -eq 'text document') {         $shell.namespace($destination).copyhere($item)     } } 

or

$zip.items() | where-object {$_.type -eq 'text document'} |      foreach-object { $shell.namespace($destination).copyhere($_)} 

how did know use type property? used:

$zip.items() 

to properties available use.