zip/unzip jar archive or add/remove file using a Basic macro?

[Regina Henschel]

Hi all,

I want to write a Basic macro to preview an .xhp file while editing it. 
Viewing such file works fine with LoadComponentFromUrl with protocol 
"vnd.sun.star.help", if the file is inside a .jar container.

But how can I modify or create or zip/unzip the content of such 
container using a Basic macro? A SimpleFileAccess sees it only as file, 
not as folder.

Kind regards
Regina