diff --git a/ext_open.py b/ext_open.py
index 03b4a76..6de1274 100644
--- a/ext_open.py
+++ b/ext_open.py
@@ -1,7 +1,23 @@
 import subprocess
 from binaryornot.check import is_binary
 import os
-EDITOR_PATH = 
+import re
+EDITOR_PATH = os.path.expandvars(r'%programfiles%\Notepad++\notepad++.exe')
+EXT = re.compile(r'\.\w+$')
+def get_ext(file):
+    match = EXT.search(file)
+    if match:
+        return match.group(0)
+
+handlers = {
+    '.py' : {
+        'editor': EDITOR_PATH,
+        'execute': 'python',
+        'idle_edit': 'pythonw -m idlelib -e',
+        'windowless': 'pythonw'
+    }
+}
+
 def edit(path,params=[]):
     call_chain = [EDITOR_PATH] + params
     if not is_binary(path):
@@ -19,7 +35,18 @@ def standalone(path,params=[],windowless =False,cwd = None):
     if windowless:
         cmd = ' '.join('~{}~'.format(arg) if ' ' in arg else arg for arg in [fullpath]+params)
         print(cmd)
-        subprocess.check_output(["cscript.exe",path2windowless,cmd,cwd])
+        subprocess.check_output(['cscript.exe',path2windowless,cmd,cwd])
     else:
 
-        subprocess.Popen([fullpath]+params,cwd=cwd)
\ No newline at end of file
+        subprocess.Popen([fullpath]+params,cwd=cwd)
+        
+def dependant(path,params=[],mode = 'execute'):
+    ext = get_ext(path)
+    if ext:
+        handler = handlers[ext][mode]
+    if ' ' in handler:
+        handler = handler.split(' ')
+    else:
+        handler = [handler]
+    args = handler+[path]+params
+    subprocess.Popen(args)