There doesn't seem to be an equivalent of those UTF-8 characters in the iso8859-1 character encoding that iconv knows of. Can you switch that windows computer to UTF-8? Can you replace the chars manually?
As the extension you used was .nfo I'm guessing you wanted a file that uses DOS (codepage 437) characters. Quite commonly used in ANSI art.
Notepad++ is quite capable of viewing UTF-8, simply select Encoding->UTF-8.
The version of Notepad++ I have (v5.9.6.2) doesn't have CP437 encoding however most of the DOS graphics characters will display OK with Encoding->Character sets->Greek->OEM 737 or Hebrew->OEM 862