As discussed in the shout box downloaded maps now won`t open for me unless I rename them to RAR.
Below pic shows a file compare of the same map downloaded from here today 2/2/17 and on 22/1/17, the recent zips are identical apart from an extra byte at the start that stops them from working.
Click to view attachment
Tested on windows 10, Firefox and Microsoft edge (logged in & as guest)
Ubuntu Linux + Firefox (as guest)