This project intended to copy content of file into clipboard.
In linux/cygwin there are simple commands to do so:
base64 < file | clipBut there is no such easy way in the GUI.
Just place Release\Clip_B64.exe in the %AppData%\Microsoft\Windows\SendTo folder and use the "Send To" context menu to place the file on the clipboard.
The result is base64 encoded and can be pasted from the clipboard into the putty-ssh remote shell window and decoded using the console command base64 -d.