empty dialog if a file contains backslashes

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create a file with backslashes in the name (on Linux)
2. open file chooser and go to that location

What is the expected output? What do you see instead?
Instead of seeing content of directory, file chooser is empty.

Original issue reported on code.google.com by fracpete on 6 Nov 2012 at 7:51