fix: Windows DLL load issues related to PyInstaller (#377)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: RobPasMue

src/ansys/tools/installer/main.py

@@ -739,14 +739,38 @@ def _run_install_python(self, filename):
         self.setEnabled(True)
 
 
+def __restore_windows_dll_load():
+    """Restore DLL loading on Windows.
+
+    Notes
+    -----
+    PyInstaller on Windows may break DLL loading.
+    This function restores the DLL loading on Windows.
+    """
+    import sys
+
+    LOG.debug(f"sys.platform: {sys.platform}")
+    if sys.platform == "win32":
+        LOG.debug("Restoring DLL loading on Windows...")
+        import ctypes
+
+        ctypes.windll.kernel32.SetDllDirectoryA(None)
+
+
 def open_gui():
     """Start the installer as a QT Application."""
     import argparse
     import ctypes
 
+    # Enable logging early
+    enable_logging()
+
     if os.name == "nt":
         import msvcrt
 
+        # Restore DLL loading on Windows...
+        __restore_windows_dll_load()
+
         kernel32 = ctypes.windll.kernel32
 
     # Parse command-line arguments
@@ -776,8 +800,6 @@ def open_gui():
         sys.stdout = open("CONOUT$", "w")
         sys.stderr = open("CONOUT$", "w")
 
-    enable_logging()
-
     app = QtWidgets.QApplication(sys.argv)
     window = AnsysPythonInstaller()