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  • Technically, an application in windows can run ANY BINARY with our without an extension using the CreateProcess() win32 function. Windows itself will only technically execute .COM and .EXE files. If you look at your PATHEXT environment variable, you will find other file types that windows is willing to host through known registry associations. For instance, .BAT files have no binary code but windows will run them with cmd.exe. Defender has your back and I don't know why you would go seeking to open random stuff defender told you might be a problem. Commented Aug 31, 2022 at 22:51
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    Also, if a zip is password protected or corrupt, defender can't look in it and might give you a warning. Commented Aug 31, 2022 at 22:54
  • The zip isn´t password protected. The Bitdefender said it could not check those files against viruses because they were encrypded .txt files, inside those files without extension, which I am not even able to open. Perhaps I don´t sound too compllicated. English is not my native langiage.
    – Dom
    Commented Sep 1, 2022 at 10:59
  • *Hopefully I don´t sound too complicated. ...
    – Dom
    Commented Sep 1, 2022 at 11:07
  • Your English is just fine :) An encrypted text file is not a text file. If you are worried about those files, move them somewhere else and see what happens. Probably nothing. Commented Sep 1, 2022 at 13:33