the file is unreadable
A file with such a strange format for me (Lou) was part of a larger one that I managed to split. How can I finish what I started and read the file?
It looks like you have a binary file, and you should not edit that with Notepad++ (a text editor, not a binary editor).
You should edit such a file with a “hex editor”, but in your case since you don’t know already these things it is probably ill-advised for you to edit it at all.