individual file extension for files in transfer?

Hi all
using the parameter it's possible to transfer files with a different file-extension while transfer (.filepart). After completing the transfer, WinSCP renames the file to the correct file extension. (remove the .filepart)

Question:
Is it possible to change this to .tmp instead of .filepart by using a different parameter?
(Our eCom platform partner accepts only .tmp as file extension while transfer. Otherwise, they pick incomplete files up for import, which happen from time to time. They are not willing to change this since they say "there is no other partner with .filepart as temporary ending"...

Thank you VERY much for this absolutely great tool and .Net assembly!
This makes my life much easier!

Best regards
Jimmy

Thanks for your post.

This request is being tracked already:
https://winscp.net/tracker/1723
You can vote for it there.