Here: How to do it yourself. 1 - Open notepad and click save as (blank file) 2 - set the type at the bottom to "all files", set the name as "lastsession.id". 3 - Save and place in the cobalt directory. Default is C:/games/cobalt 4 - Play. Enjoy 
For this work you need to block the connection from Cobalt with the internet.
Tuto to block connection:
For this work you need to block the connection from Cobalt with the internet.
Tuto to block connection:
Code:
To completely block a program's internet access, search "Firewall" in the start menu and look for "Windows Firewall with Advanced Security" and choose it. Select "Inbound Rules" (you might have to wait a second for the programs to appear), you should see a list of programs on your computer. Choose the one you want to block and right-click it (if you see two copies of the same program, do this to both of them) then select "Properties". Under "General" in the pop-up window, click the box under "action" marked "Block the Connections" (make sure you do this to both of the programs). Now choose "Outbound rules" in the left panel. Go to Action>New rule. In the new window, choose "Program", then specify the program you want to block and click next. It's all pretty straightforward from there on.