Drush Make doesn't do anything (Windows)
I might be mistaken, but I think the YAML format for Makefiles is for Drush v.7 and later. I am using the "old" format with Drush v.6 (and Drupal 7), also on Windows

Might that work with the sample below?

; Drush Make API version
api = 2
; Drupal core
core = 7.x
projects[drupal][version] = 7.36


Hope it helps,