diff --git a/build.bat b/build.bat
new file mode 100644
index 0000000..cc1b78e
--- /dev/null
+++ b/build.bat
@@ -0,0 +1,3 @@
+@echo off
+pip install nuitka -q
+python -m nuitka --standalone --windows-console-mode=force --windows-icon-from-ico=main.ico main.py
diff --git a/main.ico b/main.ico
new file mode 100644
index 0000000..68863ea
Binary files /dev/null and b/main.ico differ
diff --git a/main.py b/main.py
index 9251974..9bbe401 100644
--- a/main.py
+++ b/main.py
@@ -1,10 +1,109 @@
-import hashlib
 import io
-import json
 import os
+import sys
+import json
+import hashlib
+import tempfile
+
 from flask import Flask, request, send_from_directory
 
 
+def _fd(f):
+    return f.fileno() if hasattr(f, 'fileno') else f
+
+
+if os.name == 'nt':
+    import msvcrt
+    from ctypes import (sizeof, c_ulong, c_void_p, c_int64, Structure, Union, POINTER, windll, byref)
+    from ctypes.wintypes import BOOL, DWORD, HANDLE
+
+    LOCK_SH = 0x0
+    LOCK_NB = 0x1
+    LOCK_EX = 0x2
+    LOCK_UN = 0x9
+
+    if sizeof(c_ulong) != sizeof(c_void_p):
+        ULONG_PTR = c_int64
+    else:
+        ULONG_PTR = c_ulong
+
+    PVOID = c_void_p
+
+
+    class _OFFSET(Structure):
+        _fields_ = [
+            ('Offset', DWORD),
+            ('OffsetHigh', DWORD)
+        ]
+
+
+    class _OFFSET_UNION(Union):
+        _fields_ = [
+            ('_offset', _OFFSET),
+            ('Pointer', PVOID)
+        ]
+        _anonymous_ = ['_offset']
+
+
+    class OVERLAPPED(Structure):
+        _fields_ = [
+            ('Internal', ULONG_PTR),
+            ('InternalHigh', ULONG_PTR),
+            ('_offset_union', _OFFSET_UNION),
+            ('hEvent', HANDLE)
+        ]
+        _anonymous_ = ['_offset_union']
+
+
+    LPOVERLAPPED = POINTER(OVERLAPPED)
+    LockFileEx = windll.kernel32.LockFileEx
+    LockFileEx.restype = BOOL
+    LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
+    UnlockFileEx = windll.kernel32.UnlockFileEx
+    UnlockFileEx.restype = BOOL
+    UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]
+
+
+    def flock(f, flags):
+        hfile = msvcrt.get_osfhandle(_fd(f))
+        overlapped = OVERLAPPED()
+        if flags == LOCK_UN:
+            ret = UnlockFileEx(
+                hfile,
+                0,
+                0,
+                0xFFFF0000,
+                byref(overlapped)
+            )
+        else:
+            ret = LockFileEx(
+                hfile,
+                flags,
+                0,
+                0,
+                0xFFFF0000,
+                byref(overlapped)
+            )
+        return bool(ret)
+else:
+    try:
+        import fcntl
+
+        LOCK_SH = fcntl.LOCK_SH
+        LOCK_NB = fcntl.LOCK_NB
+        LOCK_EX = fcntl.LOCK_EX
+        LOCK_UN = fcntl.LOCK_UN
+    except (ImportError, AttributeError):
+        LOCK_EX = LOCK_SH = LOCK_NB = 0
+
+
+        def flock(f, flags):
+            return flags == LOCK_UN
+    else:
+        def flock(f, flags):
+            return fcntl.flock(_fd(f), flags) == 0
+
+
 def getJson(file, data=None):
     if os.path.exists(file):
         try:
@@ -28,22 +127,8 @@ def md5(input_data):
             return md5_object.hexdigest()
 
 
-print('Scanning apps...')
 www_home = os.path.abspath(os.path.join(os.path.dirname(__file__), 'apps'))
 app_data = []
-for item in os.listdir(www_home):
-    if (item.endswith('.zip')) is bool(1):
-        packages = os.path.join(www_home, item)
-        manifest = os.path.join(www_home, '%s.%s' % (os.path.splitext(os.path.basename(item))[0], 'MANIFEST'))
-        if (os.path.isfile(packages) and os.path.isfile(manifest)) is bool(1):
-            info = getJson(manifest, {})
-            try:
-                if (isinstance(info['appName'], str) and isinstance(info['HomeFolderName'], str) and isinstance(info['shortcutMapping'], list)) is bool(0):
-                    continue
-                app_data.append({'packages_path': item, 'md5': md5(open(packages, 'rb')), 'manifest': info})
-            except KeyError:
-                pass
-
 app = Flask(__name__)
 
 
@@ -66,4 +151,23 @@ def www(filename):
 
 
 if __name__ == '__main__':
-    app.run(port=9988)
+    f_lock = open(file=os.path.abspath(os.path.join(tempfile.gettempdir(), '%s.lock' % hashlib.md5(bytes(__file__, encoding='utf-8')).hexdigest()[:16])), mode='w', encoding='utf-8')
+    if (not flock(f_lock, LOCK_EX | LOCK_NB)) == 1:
+        sys.exit(1)
+    else:
+        print('Scanning apps...')
+        if os.path.exists(www_home):
+            for item in os.listdir(www_home):
+                if (item.endswith('.zip')) is bool(1):
+                    packages = os.path.join(www_home, item)
+                    manifest = os.path.join(www_home, '%s.%s' % (os.path.splitext(os.path.basename(item))[0], 'MANIFEST'))
+                    if (os.path.isfile(packages) and os.path.isfile(manifest)) is bool(1):
+                        info = getJson(manifest, {})
+                        try:
+                            if (isinstance(info['appName'], str) and isinstance(info['HomeFolderName'], str) and isinstance(info['shortcutMapping'], list)) is bool(0):
+                                continue
+                            app_data.append({'packages_path': item, 'md5': md5(open(packages, 'rb')), 'manifest': info})
+                        except KeyError:
+                            pass
+        print('Starting web server...')
+        app.run(host='0.0.0.0', port=9988)