I now recall why I run .txt file in a new Word.application
My .txt files have special characters, including non western (Arabic, Chinese) and I got issues reading .txt files

I tried to implement the method here - Solving the Unicode, UTF8, UTF16 and Text Files conundrum in VBA - Francesco Foti's weblog - which read text file as binary and convert special characters but I failed to even run it. Too bad as the code works for all platform (Windows, MAC). Other common method I have found is ADOB.stream with Charset = "utf-8".

Txt files seem to be problematic, I am wondering if I am not better consider using .docx instead.