choose-file で初期提案ファイル名を指定したい

[wbardwell]

You should be able to choose the default filename if you include it in a full URL that you provide as the default-location argument. It is not selected in the dialog box, but it is pre-entered in the filename text field. Note that this only works if you are privileged or if running non-privileged if the Url is a PrivilegedUrl.