Description of the issue

When building on Windows, using PySide6 6.3 or later, the packaged app fails to run, popping up an "Unhandled exception in script" dialog, with the error:
"ImportError: DLL load failed while importing QtCore: The specified module could not be found."

The error does not occur when packaging with PySide 6.2.4.

Context information (for bug reports)

• Output of pyinstaller --version: 5.1

• Version of Python: Python 3.10.5

• Platform: Windows-10-10.0.19044-SP0

• How you installed Python: Windows installer from python.org/downloads

• Did you also try this on another platform? Does it work there?
  Yes, the build works fine on macOS 10.14

• try the latest development version, using the following command:

pip install https://github.com/pyinstaller/pyinstaller/archive/develop.zip

Tried this, but it made no difference.

The pyinstaller output suggests that some Microsoft runtime DLLs from Shiboken are not being packaged:

54847 INFO: Looking for dynamic libraries
1080 WARNING: lib not found: Qt6Pdf.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\imageformats\qpdf.dll
1111 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\tls\qcertonlybackend.dll
1166 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\tls\qopensslbackend.dll1208 WARNING: lib not found: api-ms-win-shcore-scaling-l1-1-1.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\platforms\qwindows.dll
1215 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\platforms\qwindows.dll
1339 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\tls\qschannelbackend.dll
1444 WARNING: lib not found: api-ms-win-shcore-scaling-l1-1-1.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\platforms\qdirect2d.dll
1453 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\platforms\qdirect2d.dll1513 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\plugins\networkinformation\qnetworklistmanager.dll
1706 WARNING: lib not found: MSVCP140_2.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\QtGui.pyd
1736 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\QtGui.pyd
1782 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\QtWidgets.pyd
1820 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\QtCore.pyd
1852 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\QtNetwork.pyd
1976 WARNING: lib not found: MSVCP140_1.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Gui.dll
1988 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Gui.dll
2013 WARNING: lib not found: MSVCP140_2.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Gui.dll
2091 WARNING: lib not found: MSVCP140_1.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Core.dll
2103 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Core.dll
2151 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Network.dll
2219 WARNING: lib not found: MSVCP140_1.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Widgets.dll
2235 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Widgets.dll
2290 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6VirtualKeyboard.dll
2365 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Qml.dll
2472 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\lib\site-packages\PySide6\pyside6.abi3.dll
2581 WARNING: lib not found: MSVCP140_1.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Quick.dll
2594 WARNING: lib not found: MSVCP140.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Quick.dll
2611 WARNING: lib not found: MSVCP140_2.dll dependency of C:\JamesWorkArea\Code\multiscript\venv3.10\Lib\site-packages\PySide6\Qt6Quick.dll