Re: How to Make the File Mask Permanent - Currently Resets When WinSCP is Restarted
                The file panel filter cannot be persisted. But to hide the hidden files, you do not need to use the filter. There's a separate option for that. 
See https://winscp.net/eng/docs/ui_file_panel#hidden_files
        See https://winscp.net/eng/docs/ui_file_panel#hidden_files