where can I get information on 'Scripting.FileSystemObject'?

See MSDN FileSystemObject Object Reference and MSDN Folder Object Reference.

Update:

Does anyone know how can I obtain the number of file and folders using the same method?

You could try (untested):

my $folder = Win32::OLE->CreateObject('Scripting.FileSystemObject')->G
+etFolder($TargetPath);
my $file_count = $folder->Files()->Count();
my $folder_count = $folder->SubFolders()->Count();
my $total = $file_count + $folder_count;
[download]

bbfu
Black flowers blossom
Fearless on my breath