Reload a save file from before you attempted the final missions. Ensure you have completed the following missions in order:
), the code for the safe in the mission "Domo Arigato Domestoboto" is Did you download this file from a specific modding website private drive link
The operating system literally refuses to lie to the game. So the game assumes you are a thief. It asks for the password. You type anything. It laughs. Windows closes the program.