UNIX to Win98 via FTP: How to keep same

Sending a text file from UNIX to Win98 PC.
Name of the file: text.txt
Windows ADDS this: text.txt.~1~
So now when we do it again, the file does not get overwritten, it writes a new file: text.txt.~2~
This is concerning because the HD will fill up after a month of doing this.
How can we get Windows to stop adding the “.tilde # tilde”?