When I'm looking for a file on a program launched by wine, I'm directed to windows virtual drive. Its annoying to surf until I access ubuntu home folder. However, there is a Favorites bar.
How to add an ubuntu/home folder to Favorites bar?
Just add a symlink to ~/.wine/drive_c/users/<YOUR_USERNAME>/Favorites
and it will appear in Wine programs' file dialogs in the Favorites section.
To do this from a terminal (replace ~/Desktop/favorite_folder
with your desired path):
cd ~/.wine/drive_c/users/`whoami`/Favorites
ln -s ~/Desktop/favorite_folder .