Description:
------------
After creating a Zip-File including subfolders in it, the Structure can not be read with Windows' own Utility (ZIP-compressed Folder - not sure if this is translated correct). All Files that should appear in Subfolder are not shown at all. 

With WinZip or WinRAR everything is OK. I checked also with System.IO.Packaging API and this Engine is also not able to read the Archive.

I used the updated php_zip.dll from php5.2-win32-latest as mentioned in Bug-Report 39506.




Reproduce code:
---------------
$zip = new ZipArchive;
$res = $zip->open('some.zip', ZipArchive::CREATE);
if ($res === TRUE) {
	$zip->addFile('file1.txt', 'file1.txt');
	$zip->addFile('file2.txt', '/sub/file2.txt');
}

Expected result:
----------------
Zip-File with structure

file1.txt
sub
 |
 +-file2.txt



Actual result:
--------------
Structure in Windows-Tool and System.IO.Packaging API

file1.txt

Structure in WinZip / WinRar

file1.txt
sub
 |
 +-file2.txt