I want to ask you what text editor are You using. Long time i had used notepad++(only windows :/) then i used atom, visual studiocode and now i am using visual studio(they are different).
A lot of them have got problem with encoding.. Notepad++ have problem with unix files, atom and visual code studio haven't automatic search of encoding(i damaged a lot of files becouse a lot of them was in ascii, however text editor was set for utf-8)
Visiual studio hasn't this problem but it's huge application and version for macOS isn't too good how for windows. Extensions which this app don't know, don't want to open :/
