diff --git a/ntfsutils/fs.py b/ntfsutils/fs.py
index c90a711..7f6629c 100644
--- a/ntfsutils/fs.py
+++ b/ntfsutils/fs.py
@@ -28,7 +28,7 @@
 
 MAX_PATH = 260
 
-INVALID_HANDLE_VALUE = -1
+INVALID_HANDLE_VALUE = HANDLE(-1).value
 
 class FILETIME(ctypes.Structure):
     _fields_ = [("dwLowDateTime", DWORD),
diff --git a/ntfsutils/junction.py b/ntfsutils/junction.py
index 4c49802..b0da63c 100644
--- a/ntfsutils/junction.py
+++ b/ntfsutils/junction.py
@@ -100,10 +100,13 @@ def unparsed_unconvert(path):
     return path
 
 def isjunction(path):
-    if not os.path.exists(path) or not fs.junctions_supported(path):
+    if not fs.junctions_supported(path):
         return False
 
     attrs = GetFileAttributes(path)
+    if attrs == DWORD(-1).value:
+        return False
+
     return bool((attrs & fs.FILE_ATTRIBUTE_DIRECTORY) and
                 (attrs & fs.FILE_ATTRIBUTE_REPARSE_POINT))
 
@@ -157,7 +160,7 @@ def readlink(path):
     if not isjunction(path):
         raise Exception("%s does not exist or is not a junction" % path)
 
-    hlink = CreateFile(path, fs.GENERIC_READ, fs.FILE_SHARE_READ, None,
+    hlink = CreateFile(path, 0, fs.FILE_SHARE_READ, None,
         fs.OPEN_EXISTING,
         fs.FILE_FLAG_OPEN_REPARSE_POINT | fs.FILE_FLAG_BACKUP_SEMANTICS,
         None)