Mike resurrected an old computer to look through some old floppies, but they're password protected and he can't remember the password. Leo says that if Mike can figure out how he password protected it, that could give him a clue. But floppy disks weren't normally password protected. So it's an odd thing for a password pop up to happen. It may be possible to examine the disk using a Linux computer. That could lead to being able to read it. But not for very much longer, as Linux will not support floppies moving forward. Linux has some low-level tools that could examine each sector and get the data off.
Here are a few links that could help -