Cheers Black Veils, your help is greatly appreciated. The technique is a bit tedious, but the effect is mint. I moved everything to where I wanted it now, only one problem remains:
I have Wine -> Programs -> Picasa 3 and in there
* Configure Picasa Photo Viewer
* Picasa 3
I cannot find .desktop files to edit for these three. Any idea where to look? Thanks again!
And in case someone else comes here with a similar problem:
I found working through the terminal much more convenient. Somehow Nautilus did not display the ».desktop« endings of the files and on right click I could not choose a programme to open them with. So I went for
Also note that some of the .desktop-files have different names from what appears in the menu (»Configure Wine« -> »wine-winecfg.desktop« for instance).
sudo kate /usr/share/applications/<fielname>.desktop