Which Windows versions include where with shebang support?

Question

I am using pyenv-win and discovered that in my Windows version (20H2 19042.1165), where.exe supports scripts with shebang:

C:\> where python
C:\Users\ded\.pyenv\pyenv-win\shims\python
C:\Users\ded\.pyenv\pyenv-win\shims\python.bat

First python file is:

#!/bin/sh
pyenv exec $(basename "$0") "$@"

What is the magic? Is is native shebang support in where.exe? Which Windows version include this feature?

PS: Running python in a cmd will execute python.bat not python.

Answer 1

where.exe is finding a file in the path with the name you specified. If there is no extension, it also tries all extensions listed in the PATHEXT environment variable. Your file doesn't need a shebang to be found.

Below creates a few text files and where finds the no-extension one as well as the one with an extension listed in PATHEXT:

C:>set pathext
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.py;.pyw

C:>echo >abc

C:>echo >abc.txt

C:>echo >abc.bat

C:>where abc
C:\abc
C:\abc.bat