Windows phones "do" support file transfer over wifi.

[WPCentral Question]

SEE THIS LINK, I HAV TESTED IT MYSELF AND IT WORKED FOR ME, IN COLLEGE WE DAILY SEND MOVIES OR SUCH BIG FILES OVER WIFI BETWEEN TWO WINDOWS PHONES.
HERE'S HOW IT WORKS,

gadgetengineeringpro.blogspot.in/2014/09/windows-phones-now-supports-file.html