You dont need Sandboxie.
1. Copy the Launcher.exe File to
Code:
X:\ProgramData\Electronic Arts\Need For Speed World\Data
2. Start the Shortcut Creator , you can find it in the zip file too.
3. Create your Shortcuts for every Account you want to start.
4. Open one of these Shortcuts, wait for the nfsw window and start gmz's hack ( link above )
5. start again one shortcut ( another account ) and open gmz's hack again, it will automatical look for the search window and show up.
6. repeat step 5 for your other account wich you want to open ...