Image problem : Can't Open with... Preview
There are two possible issues at play here.


The first is a file association issue. If you right-click the file, and choose Open With, does it show Preview (default) at the top? If not, then it's a file association issue.





The second is either a) file permissions issue; or b) corrupt file. For instance, you may be able to view the file listing on the remote share, but not actually access the file itself. To verify that either of these issues are not a concern, copy the remote file to your Desktop and try to open it locally. If you get an error copying the file, then you know it is a file permissions/accessibility issue. If you can copy it, but it fails to open properly in Preview, then you just have a corrupt file.