Actually, I think that it is, if it supports UTF-8 without BOM and does not try to do such things like convert quotation marks into non-ASCII quotation marks au

Actually, I think that it is, if it supports UTF-8 without BOM and does not try to do such things like convert quotation marks into non-ASCII quotation marks automatically, etc. However, using a proper ASCII text editor would be better, if you do not want Unicode, to avoid many of the problems with Unicode if you are loading an unknown file or copying unknown stuff using clipboard, etc, which may be homoglyphs, reverse text direction override, etc. (I use vim with exclusively ASCII-only mode, and do not use a Unicode locale, on my computer.)