To exclude file extension from Symantec Endpoint security risk scan

1. Open Symantec Endpoint Protection Manager Console.
2. Login in admin rights.
3. Select "Policies" on the left pane.
4. Click "centralized exceptions".
5. Right click the right pane and press "add"
6. Name the new created policy.
7. Click "centralized exceptions".
8. On the right pane press Add > security risk exceptions > file extension
9. Type the file extension and click "add".
10. Press OK.