To support free-threaded builds, the Windows venv redirector executables have been renamed in Python 3.13.
The executables were under Lib/venv/scripts/nt and were named python.exe and pythonw.exe. They have been renamed to venvlauncher.exe and venvwlauncher.exe respectively. This causes virtualenv not to find the shim and to copy DLLs, etc., into the virtual environment.
There may be other issues because of this change.
In the meantime, a possible workaround could be to create file symbolic links.

References:

• Build changes for Windows free-threaded builds python/cpython#112984
• gh-112984 Update Windows build for free-threaded builds python/cpython#113129
• https://discuss.python.org/t/when-should-venv-scripts-nt-python-exe-be-present/47620