Optional 

hq: 

The file selection dialog box should come up in a directory that makes sense for the task. For example, when saving a new file from an editor, the file selection box should come up in the user's home directory. If the user navigates to some other directory within the file selection box, the application should remember that directory the next time it is brought up. 

Optional 

hr: 

Users should never be allowed to overwrite an existing file through the file selection box without a warning dialog box prompt. 

Optional 

hs: 

Keyboard focus should be placed in the file name field each time users bring up a file selection dialog box.