I use 5.8.5 version of notepad++. The .tex file that I have edited on notepad++ could not be opened on gedit. The error I get is "character set could not be recognized"
Two things to try (from the commandline):
(requires the tofrodos package).
That should remove any characters not compatible with UTF-8.
(You should also follow the advice in the other answer about putting
My latex files are all utf8 and compile on windows and on linux.
I would use
in the main file to inform the