how to get a list of remote files in a file using winscp 5.13.1

Need to get the list in order to know new remote files that can be downloaded to my local pc

That's what ls command is for. Though WinSCP can identify/download new files for you.
See
https://winscp.net/eng/docs/faq_script_modified_files
https://winscp.net/eng/docs/script_download_most_recent_file

That is the way I had implemented using the -filemask option and created cleanup logic after that. It is cleaner and faster that the original listing of files I wanted to get. Thanks a lot.