Just append your INI file with the new sites to the user's INI file.

Btw, it's a lame way to protect the credentials. There's nothing preventing the users to actually retrieve the credentials.
See https://winscp.net/eng/docs/faq_password

Hi,

We are company that have a lot of servers, and dont want employees to see passwords to all our servers.
So now they import the inifile and get access to all servers, this works great and they cant see the passwords just login to all the servers.

The problem is that all there other login they have will be overwrited when they import the inifile. Is there a way they can import the inifile and keep there own logins?