"febbraio" with "o-grave" and "febbraio" with "greater-than-or-equal" on the
end might not be a problem - maybe it is just how you are viewing it.
"o-grave" and "greater-than-or-equal" are the same code point but in two
different code pages: Windows "ANSI" (or ISO 8859-1) vs. code page 850.
If you are viewing your ISO 8859-1 file in an MS-DOS window and if the code
page of the MS-DOS window is CP 850, then the letters will appear wrong
because of the font used to display the character, but the character code
would be correct. (Same general thing for Linux, but I'll guess it is
Windows you have.)
The character code is, of course, the important thing.
Use a hex viewer to determine if it is correct. If it is not correct,
something does not know the proper code page of the filename characters
(which depends on the filesystem or the code page in force when the file was
created - depending on your OS).