[OMCPath] differentiate between Windows and Posix for OMCPathCompatibility

Author: syntron

OMPython/OMCSession.py

@@ -420,12 +420,20 @@ def size(self) -> int:
         stacklevel=1,
     )
 
-    class OMCPathCompatibility(pathlib.Path):
+    if os.name == 'nt':
+        class OMCPathCompatibility(pathlib.WindowsPath):
 
-        def size(self) -> int:
-            return self.stat().st_size
+            def size(self) -> int:
+                return self.stat().st_size
 
-    OMCPath = OMCPathCompatibility  # noqa: F811
+        OMCPath = OMCPathCompatibility  # noqa: F811
+    else:
+        class OMCPathCompatibility(pathlib.PosixPath):
+
+            def size(self) -> int:
+                return self.stat().st_size
+
+        OMCPath = OMCPathCompatibility  # noqa: F811
 
 else:
     OMCPath = OMCPathReal