Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
Those three characters are UTB-8 BOM. It's perfectly correct to be in the file. Though many *nix program cannot handle them. For this reason WinSCP removes them during ASCII/text mode upload with SFTP and SCP. Not with FTP. So I suppose you are using FTP, right?