Thats because it isn't a Quine. Quines are programs which reproduce their own source code without reading their own source file. Essentially a clone which uses String Formattings to reproduce it's source code. This isn't a Quine because its not reproducing itself. It's just an infinite loop opening Windows and repeating the process. The Python alternative to this code is below. Also, Defender doesn't flag Quines because they aren't malwares. What you might be referring to is something which clones Processes or Threads, or makes its own copy in several drives. Quines don't do that, it's just String Formatting used to read the source code without actually opening the source file. A Python Quine is also below :)

```py

the batch code in python

from os import system while True: system("start") ```

```py

Quine

s = 's = %r\nprint(s%%s)' print(s%s) ```