diff --git a/lib/core/common.py b/lib/core/common.py
index b9ad2f645..43c4535ad 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -871,11 +871,18 @@ def directoryPath(path):
     return retVal
 
 def normalizePath(path):
+    """
+    This function must be called only after posixToNtSlashes()
+    and ntToPosixSlashes()
+    """
+
     retVal = None
+
     if isWindowsPath(path):
         retVal = ntpath.normpath(path)
     else:
         retVal = posixpath.normpath(path)
+
     return retVal
 
 def safeStringFormat(formatStr, params):
@@ -927,7 +934,7 @@ def decloakToMkstemp(filepath, **kwargs):
     return retVal
 
 def isWindowsPath(filepath):
-    return re.search("\A[A-Za-z]:", filepath) is not None
+    return re.search("\A[\w]\:\\\\", filepath) is not None
 
 def posixToNtSlashes(filepath):
     return filepath.replace('/', '\\')
diff --git a/plugins/generic/misc.py b/plugins/generic/misc.py
index 88bcc7040..162d26ae0 100644
--- a/plugins/generic/misc.py
+++ b/plugins/generic/misc.py
@@ -65,7 +65,7 @@ class Miscellaneous:
             else:
                 conf.tmpPath = "/tmp"
 
-        if re.search("^[\w]\:[\/\\\\]+", conf.tmpPath, re.I):
+        if re.search("\A[\w]:[\/\\\\]+", conf.tmpPath, re.I):
             kb.os = "Windows"
 
         conf.tmpPath = ntToPosixSlashes(conf.tmpPath)