I have installed Picasa using wine but I am not able to open any image using Picasa as there is not any option of Picasa in the list of applications which can be changed to default program for opening image files.
open picasa and go to tools-options-file type after mark all -select ok
I think this solve your problem if not solve report me
Create a desktop entry for Picasa like this:
[Desktop Entry] Version = 1.0 Icon ="path to your favorite icon" Type = Application Exec = "Path to your wine program e.g. wine "c:\picasa.exe"
Information on how to set the values for
.desktop file can be found here.
and save it as
then you should be able to set it as your default image viewer.