Permission denied when referencing executable without extension

[jaraco]

Current Behavior

Accessing an executable with an explicit extension works, but without the extension results in permission denied.

 ~ 🐚 ~\pipx\venvs\pip-run\Scripts\python.exe
Python 3.13.3 (tags/v3.13.3:6280bb5, Apr  8 2025, 14:47:33) [MSC v.1943 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> 
 ~ 🐚 ~\pipx\venvs\pip-run\Scripts\python
xonsh: subprocess mode: permission denied: C:\Users\jaraco\pipx\venvs\pip-run\Scripts\python
 ~ 🐚 '.EXE' in $PATHEXT
True

Expected Behavior

Application should be executed, honoring the PATHEXT, same as on other shells.

xonfig

+-----------------------------+-----------------+
| xonsh                       | 0.19.1          |
| Python                      | 3.13.3          |
| PLY                         | 3.11            |
| have readline               | False           |
| prompt toolkit              | 3.0.50          |
| shell type                  | prompt_toolkit  |
| history backend             | json            |
| pygments                    | 2.19.1          |
| on posix                    | False           |
| on linux                    | False           |
| on darwin                   | False           |
| on windows                  | True            |
| on cygwin                   | False           |
| on msys2                    | False           |
| is superuser                | False           |
| default encoding            | utf-8           |
| xonsh encoding              | utf-8           |
| encoding errors             | surrogateescape |
| xontrib 1                   | vox             |
| xontrib 2                   | voxapi          |
| xontrib 3                   | jaraco.xonsh    |
| RC file                     | []              |
| UPDATE_OS_ENVIRON           | False           |
| XONSH_CAPTURE_ALWAYS        | False           |
| XONSH_SUBPROC_OUTPUT_FORMAT | stream_lines    |
| THREAD_SUBPROCS             | True            |
| XONSH_CACHE_SCRIPTS         | True            |
+-----------------------------+-----------------+

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