In many TIDs you can read this:
"The iFolder Java applet is provided as is. It is no longer supported. Use
NetStorage for web-based access to your iFolder files"

iFolder from the web works for me pretty good. Even the upload button.

But when i use Netstorage and i click the 'shared' map - click 'file' -
click 'upload'
the pc gives me blank-window. I tried different version of Java...

Which version of java is fully tested to work with the Netstorage upload.