diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 0000000..53de9d6
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+
+
+from wakatime.utils import format_file_path
+
+import os
+from .utils import TestCase, mock
+
+
+class UtilsTestCase(TestCase):
+
+    def test_format_file_path_forces_forward_slashes(self):
+        path = 'some\\path////to\\\\\\a\\file.txt'
+        expected = os.path.realpath('some/path/to/a/file.txt')
+        result = format_file_path(path)
+        self.assertEquals(expected, result)
+
+    def test_format_file_path_uppercase_windows_drive(self):
+        path = 'c:\\some\\path////to\\\\\\a\\file.txt'
+        expected = 'C:/some/path/to/a/file.txt'
+
+        with mock.patch('os.path.realpath') as mock_realpath:
+            mock_realpath.return_value = path
+            with mock.patch('os.path.abspath') as mock_abspath:
+                mock_abspath.return_value = path
+
+                result = format_file_path(path)
+                self.assertEquals(expected, result)
+
+    def test_format_file_path_handles_exceptions(self):
+        path = 'c:\\some\\path////to\\\\\\a\\file.txt'
+        expected = path
+
+        with mock.patch('os.path.abspath') as mock_abspath:
+            mock_abspath.side_effect = Exception('foobar')
+
+            result = format_file_path(path)
+            self.assertEquals(expected, result)
diff --git a/wakatime/utils.py b/wakatime/utils.py
index d7a3bc6..9e04ecf 100644
--- a/wakatime/utils.py
+++ b/wakatime/utils.py
@@ -24,6 +24,10 @@ from .compat import u
 log = logging.getLogger('WakaTime')
 
 
+BACKSLASH_REPLACE_PATTERN = re.compile(r'[\\/]+')
+WINDOWS_DRIVE_PATTERN = re.compile(r'^[a-z]:/')
+
+
 def should_exclude(entity, include, exclude):
     if entity is not None and entity.strip() != '':
         for pattern in include:
@@ -74,8 +78,10 @@ def format_file_path(filepath):
 
     try:
         filepath = os.path.realpath(os.path.abspath(filepath))
-        filepath = re.sub(r'[/\\]', os.path.sep, filepath)
-    except:  # pragma: nocover
+        filepath = re.sub(BACKSLASH_REPLACE_PATTERN, '/', filepath)
+        if WINDOWS_DRIVE_PATTERN.match(filepath):
+            filepath = filepath.capitalize()
+    except:
         pass
     return filepath