facebook login.php file?

hi, just recently (since today) i found out i need save a file in order to sign in to facebook the msg says

DO YOU WANT TO SAVE THIS FILE, OR FIND ANOTHER PROGRAM ONLINE TO OPEN IT?
NAME: login.php
TYPE: UNKNOWN FILE TYPE 5.44KB
FROM: www.facebook.com

**********************************8
should i save this file? or is it a spam/virus/malware or something the like? or shouldn't worry about it at all?
 
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