py.exe launcher missing support for a shebang with a fully-qualified executable

[Khold6458]

Bug report

In previous versions, a shebang line like #! C:\full\path\to\executable or #! C:\venv\Scripts\python worked to specify the executable used to run the script. With the 3.11 py.exe launcher, this pattern is not recognized and uses a default Python interpreter instead.

I initially reported this in the comments of issue #94399 which was resolved several months ago.

Your environment

• CPython versions tested on: 3.11.0
• Operating system and architecture: Windows 10

• PR: [3.11] gh-98692: Enable treating shebang lines as executables in py.exe launcher (GH-98732) #98926