What steps will reproduce the problem?
(1) Save a file from the browser
(2) The "Save as" dialog opens

What is the expected result?
I see all the files in the currently selected folder.

What happens instead?
I only see files of the same file type as the one I'm trying to save. 

I found this really confusing and didn't even notice that the filter existed. I propose we change the default to "all files" so users always sees all the contents of the folder unless they specifically want to filter the view.