diff --git a/tests/samples/netuse/v1 b/tests/samples/netuse/v1
new file mode 100644
index 0000000..a1c7172
--- /dev/null
+++ b/tests/samples/netuse/v1
@@ -0,0 +1,7 @@
+New connections will be remembered.
+
+Status       Local     Remote                    Network
+
+-------------------------------------------------------------------------------
+             C:        \\vboxsrv\Projects         VirtualBox Shared Folders
+The command completed successfully.
diff --git a/tests/samples/netuse/v2 b/tests/samples/netuse/v2
new file mode 100644
index 0000000..827ba3a
--- /dev/null
+++ b/tests/samples/netuse/v2
@@ -0,0 +1,8 @@
+New connections will be remembered.
+
+Status       Local     Remote                    Network
+
+-------------------------------------------------------------------------------
+             C:        \\vboxsrv\Projects         VirtualBox Shared Folders
+OK           D:        \\192.0.0.1\work           VirtualBox Shared Folders
+The command completed successfully.
diff --git a/tests/test_heartbeat.py b/tests/test_heartbeat.py
index 9d6bf0b..720f295 100644
--- a/tests/test_heartbeat.py
+++ b/tests/test_heartbeat.py
@@ -6,7 +6,7 @@ from wakatime.heartbeat import Heartbeat
 import os
 import logging
 from testfixtures import log_capture
-from .utils import TestCase
+from .utils import DynamicIterable, TestCase, mock
 
 
 class HeartbeatTestCase(TestCase):
@@ -116,3 +116,31 @@ class HeartbeatTestCase(TestCase):
 
         self.assertNothingPrinted()
         self.assertNothingLogged(logs)
+
+    def test_parsing(self):
+
+        class Args(object):
+            hide_file_names = ['.*']
+            hide_project_names = []
+            plugin = None
+
+        samples = [
+            ('v1', 'C:\\v1\\file.txt', '\\\\vboxsrv\\Projects\\v1\\file.txt'),
+            ('v2', 'D:\\stuff\\v2\\file.py', '\\\\192.0.0.1\\work\\stuff\\v2\\file.py'),
+        ]
+        for sample, filepath, expected in samples:
+            with mock.patch('wakatime.heartbeat.Popen') as mock_popen:
+
+                class MockCommunicate(object):
+                    pass
+
+                stdout = open('tests/samples/netuse/' + sample).read()
+                mock_communicate = MockCommunicate()
+                mock_communicate.communicate = mock.MagicMock(return_value=DynamicIterable((stdout, ''), max_calls=1))
+                mock_popen.return_value = mock_communicate
+
+                heartbeat = Heartbeat({'user_agent': 'test'}, Args(), None, _clone=True)
+                result = heartbeat._to_unc_path(filepath)
+                self.assertEquals(expected, result)
+
+        self.assertNothingPrinted()
diff --git a/wakatime/compat.py b/wakatime/compat.py
index 744f3ee..18dc141 100644
--- a/wakatime/compat.py
+++ b/wakatime/compat.py
@@ -11,6 +11,7 @@
 
 
 import codecs
+import os
 import platform
 import subprocess
 import sys
@@ -115,4 +116,7 @@ class Popen(subprocess.Popen):
             except AttributeError:
                 pass
         kwargs['startupinfo'] = startupinfo
-        super(Popen, self).__init__(*args, **kwargs)
+        if 'env' not in kwargs:
+            kwargs['env'] = os.environ.copy()
+            kwargs['env']['LANG'] = 'en-US' if is_win else 'en_US.UTF-8'
+        subprocess.Popen.__init__(self, *args, **kwargs)
diff --git a/wakatime/heartbeat.py b/wakatime/heartbeat.py
index 73c25f5..7adbde0 100644
--- a/wakatime/heartbeat.py
+++ b/wakatime/heartbeat.py
@@ -10,8 +10,9 @@
 import os
 import logging
 import re
+from subprocess import PIPE
 
-from .compat import u, json
+from .compat import u, json, is_win, Popen
 from .exceptions import SkipHeartbeat
 from .project import get_project_info
 from .stats import get_file_stats
@@ -85,6 +86,7 @@ class Heartbeat(object):
                 return
             if self.type == 'file':
                 self.entity = format_file_path(self.entity)
+                self._format_local_file()
                 if not self._file_exists():
                     self.skip = u('File does not exist; ignoring this heartbeat.')
                     return
@@ -236,6 +238,84 @@ class Heartbeat(object):
         return (self.entity and os.path.isfile(self.entity) or
             self.args.local_file and os.path.isfile(self.args.local_file))
 
+    def _format_local_file(self):
+        """When args.local_file empty on Windows, tries to map args.entity to a
+        unc path.
+
+        Updates args.local_file in-place without returning anything.
+        """
+
+        if self.type != 'file':
+            return
+
+        if not is_win:
+            return
+
+        if self._file_exists():
+            return
+
+        self.args.local_file = self._to_unc_path(self.entity)
+
+    def _to_unc_path(self, filepath):
+        drive, rest = self._splitdrive(filepath)
+        if not drive:
+            return filepath
+
+        stdout = None
+        try:
+            stdout, stderr = Popen(['net', 'use'], stdout=PIPE, stderr=PIPE).communicate()
+        except OSError:
+            pass
+        else:
+            if stdout:
+                cols = None
+                for line in stdout.strip().splitlines()[1:]:
+                    line = u(line)
+                    if not line.strip():
+                        continue
+                    if not cols:
+                        cols = self._unc_columns(line)
+                        continue
+                    start, end = cols.get('local', (0, 0))
+                    if not start and not end:
+                        break
+                    local = line[start:end].strip().split(':')[0].upper()
+                    if not local.isalpha():
+                        continue
+                    if local == drive:
+                        start, end = cols.get('remote', (0, 0))
+                        if not start and not end:
+                            break
+                        remote = line[start:end].strip()
+                        return remote + rest
+
+        return filepath
+
+    def _unc_columns(self, line):
+        cols = {}
+        current_col = u('')
+        newcol = False
+        start, end = 0, 0
+        for char in line:
+            if char.isalpha():
+                if newcol:
+                    cols[current_col.strip().lower()] = (start, end)
+                    current_col = u('')
+                    start = end
+                    newcol = False
+                current_col += u(char)
+            else:
+                newcol = True
+            end += 1
+        if start != end and current_col:
+            cols[current_col.strip().lower()] = (start, -1)
+        return cols
+
+    def _splitdrive(self, filepath):
+        if filepath[1:2] != ':' or not filepath[0].isalpha():
+            return None, filepath
+        return filepath[0].upper(), filepath[2:]
+
     def _excluded_by_pattern(self):
         return should_exclude(self.entity, self.args.include, self.args.exclude)
 
diff --git a/wakatime/projects/subversion.py b/wakatime/projects/subversion.py
index d4f9572..ac6487b 100644
--- a/wakatime/projects/subversion.py
+++ b/wakatime/projects/subversion.py
@@ -70,17 +70,17 @@ class Subversion(BaseProject):
         if not self._is_mac() or self._has_xcode_tools():
             stdout = None
             try:
-                os.environ['LANG'] = 'en_US'
-                stdout, stderr = Popen([
-                    self._find_binary(), 'info', os.path.realpath(path)
-                ], stdout=PIPE, stderr=PIPE).communicate()
+                stdout, stderr = Popen(
+                    [self._find_binary(), 'info', os.path.realpath(path)],
+                    stdout=PIPE,
+                    stderr=PIPE,
+                ).communicate()
             except OSError:
                 pass
             else:
                 if stdout:
                     for line in stdout.splitlines():
-                        line = u(line)
-                        line = line.split(': ', 1)
+                        line = u(line).split(': ', 1)
                         if len(line) == 2:
                             info[line[0]] = line[1]
         return info