So are you actually asking how to disable the transfer to temporary file name in scripting?
See the end of this chapter:
https://winscp.net/eng/docs/resume#automatic

By the way, I am using Version 5.9 (Build 6786)

Good Afternoon,

I would like to know how to remove the .filepart when transmitting a data. I have my "Enable transfer resume/transfer to temporary filename for" as disabled. I did tried researching the issue on the web, unfortunately, none of them has helped me. My job automation is failing because of the .filepart. If I transfer the file straight from WinSCP, the filepart doesn't show up.

Any help will do.

Thank you in advance.