Is a bad thing , to quote myself.
I finally got the two versions of RautorViewer to play nice with Java Web Start ! Seems that an unsigned application will drown JfileChooser with absolutely no errror or warning. So the Lite version works speedily with local files, whereas the humongous full version can access session over FTP servers.
Now I have to figure out how the httpclient stuff works with VFSJFileChooser