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In FTP, when you click on a file or directory, you should be able to access an option to set "Attributes", "Properties", or "Permissions" for the file. (These terms sometimes used interchangeably.
I believe the Windows server has fewer options, but, will try to accomdate whatever you put in via FTP. (For example, Windows a global read-only, not three levels of read-only, I believe.)
In any event, you set these in your FTP client. If you can't find it, tell us which FTP client you are using... perhaps we can recommend alternative FTP clients.