FTP Files Problem

I' m having a weird problem with FTP. If I send a file using a client like Filezilla it will send the file over to an FTP server without a problem. However if I send the file over via windows command line ftp it will send the file short some bits. Example if I send putty.exe 454,656 filesize ... when it' s done sending to the ftp server I will have a file with the size of 453,598 on the server. Something is shaving my files off when I send by command line. The files are not getting logged a viruses. Any thoughts?