Overriding the server site (FTP username & password)

Hi, Wyat. A short question:

According to the documentation it is possible to override the server site built into wyUpdate by calling wyupdate.exe this way:

wyupdate.exe -server="http://example.com/server.wys".

But, in my case, I need to override the server site with an FTP site. I imagine this can be very easily done by supplying the follwing command line:

wyupdate.exe -server="ftp://MyFTPSite.com/MaybeSomeSubFolders/server.wys".

But then: How can I tell wyupdate.exe to use a certain username/password with the FTP-site?

Hope you see my problem.

-Martin.