Windows fix.

Apparently `Path.is_absolute` and/or `Path.exists` can fail with
OSError with Python < 3.10 on Windows. The error didn't occur earlier
when we used `os.path` instead.

src/robot/utils/filereader.py

@@ -69,9 +69,11 @@ def _get_path(self, source: Source, accept_text: bool):
         if '\n' in source:
             return None
         path = Path(source)
-        if path.is_absolute() or path.exists():
-            return source
-        return None
+        try:
+            is_path = path.is_absolute() or path.exists()
+        except OSError:
+            is_path = False
+        return source if is_path else None
 
     @property
     def name(self) -> str:

utest/utils/test_filereader.py

@@ -94,12 +94,17 @@ def test_bytesio(self):
             assert_reader(reader, '<in-memory file>')
         assert_open(f)
 
-    def test_accept_text(self):
+    def test_text(self):
         with FileReader(STRING, accept_text=True) as reader:
             assert_reader(reader, '<in-memory file>')
         assert_closed(reader.file)
 
-    def test_no_accept_text(self):
+    def test_text_with_special_chars(self):
+        for text in '!"#¤%&/()=?', '*** Test Cases ***', '':
+            with FileReader(text, accept_text=True) as reader:
+                assert_equal(reader.read(), text)
+
+    def test_text_when_text_is_not_accepted(self):
         assert_raises(IOError, FileReader, STRING)
 
     def test_readlines(self):