"A couple of us showed you links to articles on El Reg covering that. Why don't you go and read them?I did. They weren't at all about "opening a text file"; they describe executing the commands in a Word document by opening a word document and explicitly allowing Word to run the malicious code therein. Word warns you when opening such a document."
Melissa.txt I describe below is a text file. Opening it in Word, or Notepad does not infect the machine. Your claim is thus demonstrated to be totally and utterly false.
BTW LibreOffice Writer also allows the creation of macros. Since that application also runs on Linux, it's possible for documents opened on that platform to do malicious things.