How to remember password when save files in WinSCP

Hello!
Unfortunately I spent several hours trying to fix this recent problem with WinSCP.
I'm using it on a small netbook equipped with XP.
The issue is that each time I open a file directly into the server with which I'm connected to, and then I modify and save it, the prompt appears asking me again for the password. For me it's very boring because actually I have a limited list of different password to use each time I have to connect to this server (for administrative reasons) , so in this way I waste my passwords much more times than I would have do.
I already tried to active the option "Remember password in main session for background transferts", but the problem remains.:( :(
Please is there somebody could help me?
Thanks!!

Do I understand right that you need to use a different password each time? Then there's no solution for you. WinSCP uses different connection to upload saved file. So it has to authenticate again.