I have installed drush launcher & placed .phar file after making it executable but the drush commmand only runs with drush.php.
I also made a bat file with following code but it didn't work.
@echo off php "%~dp0\drush.phar" %*
In windows configuring drush is little bit tricky. And you need some supporting software to do that. Here's a blog post you can follow, might helpful. Drush on Windows 10/8.1