How to rename a directory in a zip file?

Question

I'm trying to rename a directory in a ZIP file using Java 7 NIO.

The zip file is very simple: it contains a "TestFolder" directory, which contains a "test.txt" file.

I want to rename TestFolder to NewFolder.

Here is my code:

public class Test {

    public static void main(String[] args) {
        Path test = Paths.get("C:\\myZipFile.zip");

        try (FileSystem zipfsWin = FileSystems.newFileSystem(test, null)) {
            Path oldFolderName = zipfsWin.getPath("/TestFolder");
            Path newFolderName = zipfsWin.getPath("/NewFolder");
            Files.move(oldFolderName, newFolderName);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

The problem is that after running this code, the TestFolder is still here, with its text file and I have a new empty NewFolder directory.

What am I missing?