Good news!
Working version:
@echo off
for %%a in ("%cd%") do set folder=%%~na
winscp.com /command "open devuser at 172.16.16.11
-privatekey=C:\Users\suliman\.ssh\123.ppk" "put latest.tar.gz
/home/devuser/folder/" "exit"
1. File-name hard-coded
2. WinSCP should be installed and added to PATH