You need the latest Version of Cheat-Engine to open it
Attach Cheat-Engine to "nfsw.exe" and change Value in the List from "74" to "EB".
Its usefull if you want to explore some Out-of-Map Stuff, no need to search for Glitches anymore :P
Already found all 3 Safehouses with it, maybe you can find Minimap-Canyons or Driftcourse, San Juan etc., im not sure if they were cutted in this Version already.
Its for this Version:
Here i found the 3 Safehouses:
Have fun!