Here is the solution to copy files from Linux to Windows using SCP without password by ssh:
Install sshpass in Linux machine to skip password prompt
Script
sshpass -p 'xxxxxxx' scp /home/user1/*.* testuser@x.x.x.x:/d/test/
Details:
sshpass -p 'password' scp /source_path/*.* windowsusername@windowsMachine_ip:/destination_drive/subfolder/