diff --git a/direct/src/showutil/FreezeTool.py b/direct/src/showutil/FreezeTool.py
index c734c56101..b0c1af3d00 100644
--- a/direct/src/showutil/FreezeTool.py
+++ b/direct/src/showutil/FreezeTool.py
@@ -7,6 +7,7 @@ import os
 import marshal
 import imp
 import platform
+import struct
 from io import StringIO
 import distutils.sysconfig as sysconf
 
@@ -1549,6 +1550,93 @@ class Freezer:
 
         return target
 
+    def generateRuntimeFromStub(self, basename):
+        def make_module_list_entry(code, offset, modulename, module):
+            size = len(code)
+            if getattr(module, "__path__", None):
+                # Indicate package by negative size
+                size = -size
+            return struct.pack('<256sIi', bytes(modulename, 'ascii'), offset, size)
+
+        def make_forbidden_module_list_entry(modulename):
+            return struct.pack('<256sIi', bytes(modulename, 'ascii'), 0, 0)
+
+        # We must have a __main__ module to make an exe file.
+        if not self.__writingModule('__main__'):
+            message = "Can't generate an executable without a __main__ module."
+            raise Exception(message)
+
+        if self.platform.startswith('win'):
+            target = basename + '.exe'
+        else:
+            target = basename
+
+
+        # Generate export table.
+        moduleBlob = bytes()
+        codeOffset = 0
+        moduleList = []
+
+        for moduleName, mdef in self.getModuleDefs():
+            origName = mdef.moduleName
+            if mdef.forbid:
+                # Explicitly disallow importing this module.
+                moduleList.append(make_forbidden_module_list_entry(moduleName))
+                continue
+
+            assert not mdef.exclude
+            # Allow importing this module.
+            module = self.mf.modules.get(origName, None)
+            code = getattr(module, "__code__", None)
+            if code:
+                code = marshal.dumps(code)
+                moduleList.append(make_module_list_entry(code, codeOffset, moduleName, module))
+                moduleBlob += code
+                codeOffset += len(code)
+                continue
+
+            # This is a module with no associated Python code.  It is either
+            # an extension module or a builtin module.  Get the filename, if
+            # it is the former.
+            extensionFilename = getattr(module, '__file__', None)
+
+            if extensionFilename or self.linkExtensionModules:
+                self.extras.append((moduleName, extensionFilename))
+
+            # If it is a submodule of a frozen module, Python will have
+            # trouble importing it as a builtin module.  Synthesize a frozen
+            # module that loads it as builtin.
+            if '.' in moduleName and self.linkExtensionModules:
+                code = compile('import sys;del sys.modules["%s"];import imp;imp.init_builtin("%s")' % (moduleName, moduleName), moduleName, 'exec')
+                code = marshal.dumps(code)
+                moduleList.append(make_module_list_entry(code, codeOffset, moduleName, module))
+                moduleBlob += code
+                codeOffset += len(code)
+            elif '.' in moduleName:
+                # Nothing we can do about this case except warn the user they
+                # are in for some trouble.
+                print('WARNING: Python cannot import extension modules under '
+                      'frozen Python packages; %s will be inaccessible.  '
+                      'passing either -l to link in extension modules or use '
+                      '-x %s to exclude the entire package.' % (moduleName, moduleName.split('.')[0]))
+
+        # Build from pre-built binary stub
+        stub_path = os.path.join(os.path.dirname(ExecutionEnvironment.get_dtool_name()), '..', 'bin', 'deploy-stub')
+        with open(stub_path, 'rb') as f:
+            stubbin = f.read()
+
+        with open(target, 'wb') as f:
+            f.write(stubbin)
+            listoffset = f.tell()
+            for mod in moduleList:
+                f.write(mod)
+            modsoffset = f.tell()
+            f.write(moduleBlob)
+            f.write(struct.pack('<I', listoffset))
+            f.write(struct.pack('<I', modsoffset))
+            f.write(struct.pack('<I', len(moduleList)))
+        os.chmod(target, 0o755)
+
     def makeModuleDef(self, mangledName, code):
         result = ''
         result += 'static unsigned char %s[] = {' % (mangledName)
diff --git a/direct/src/showutil/yapdt.py b/direct/src/showutil/yapdt.py
index 3eb9829807..9b0dced6a4 100755
--- a/direct/src/showutil/yapdt.py
+++ b/direct/src/showutil/yapdt.py
@@ -1,96 +1,13 @@
 #!/usr/bin/env python
-import marshal
-import os
-import struct
-
 from direct.showutil import FreezeTool
-import panda3d.core as p3d
-
-def make_module_list_entry(code, offset, modulename, module):
-    size = len(code)
-    if getattr(module, "__path__", None):
-        # Indicate package by negative size
-        size = -size
-    return struct.pack('<256sIi', bytes(modulename, 'ascii'), offset, size)
-
-def make_forbidden_module_list_entry(modulename):
-    return struct.pack('<256sIi', bytes(modulename, 'ascii'), 0, 0)
-
-def get_modules(freezer):
-    # Now generate the actual export table.
-    moduleBlob = bytes()
-    codeOffset = 0
-    moduleList = []
-
-    for moduleName, mdef in freezer.getModuleDefs():
-        origName = mdef.moduleName
-        if mdef.forbid:
-            # Explicitly disallow importing this module.
-            moduleList.append(make_forbidden_module_list_entry(moduleName))
-            continue
-
-        assert not mdef.exclude
-        # Allow importing this module.
-        module = freezer.mf.modules.get(origName, None)
-        code = getattr(module, "__code__", None)
-        if code:
-            code = marshal.dumps(code)
-            moduleList.append(make_module_list_entry(code, codeOffset, moduleName, module))
-            moduleBlob += code
-            codeOffset += len(code)
-            continue
-
-        # This is a module with no associated Python code.  It is either
-        # an extension module or a builtin module.  Get the filename, if
-        # it is the former.
-        extensionFilename = getattr(module, '__file__', None)
-
-        if extensionFilename or freezer.linkExtensionModules:
-            freezer.extras.append((moduleName, extensionFilename))
-
-        # If it is a submodule of a frozen module, Python will have
-        # trouble importing it as a builtin module.  Synthesize a frozen
-        # module that loads it as builtin.
-        if '.' in moduleName and freezer.linkExtensionModules:
-            code = compile('import sys;del sys.modules["%s"];import imp;imp.init_builtin("%s")' % (moduleName, moduleName), moduleName, 'exec')
-            code = marshal.dumps(code)
-            moduleList.append(make_module_list_entry(code, codeOffset, moduleName, module))
-            moduleBlob += code
-            codeOffset += len(code)
-        elif '.' in moduleName:
-            # Nothing we can do about this case except warn the user they
-            # are in for some trouble.
-            print('WARNING: Python cannot import extension modules under '
-                  'frozen Python packages; %s will be inaccessible.  '
-                  'passing either -l to link in extension modules or use '
-                  '-x %s to exclude the entire package.' % (moduleName, moduleName.split('.')[0]))
-
-    return moduleBlob, moduleList
-
 
 if __name__ == '__main__':
+    start_file = 'app.py'
+    basename = 'built_app_ng'
     # Setup Freezer
     freezer = FreezeTool.Freezer()
     freezer.keepTemporaryFiles = True
-    freezer.addModule('__main__', filename='app.py')
+    freezer.addModule('__main__', filename=start_file)
     freezer.done(addStartupModules=True)
 
-    # Build from pre-built binary stub
-    stub_path = os.path.join(os.path.dirname(p3d.ExecutionEnvironment.get_dtool_name()), '..', 'bin', 'deploy-stub')
-    out_path = 'frozen_app'
-    with open(stub_path, 'rb') as f:
-        stubbin = f.read()
-
-    modblob, modlist = get_modules(freezer)
-
-    with open(out_path, 'wb') as f:
-        f.write(stubbin)
-        listoffset = f.tell()
-        for mod in modlist:
-            f.write(mod)
-        modsoffset = f.tell()
-        f.write(modblob)
-        f.write(struct.pack('<I', listoffset))
-        f.write(struct.pack('<I', modsoffset))
-        f.write(struct.pack('<I', len(modlist)))
-    os.chmod(out_path, 0o755)
+    freezer.generateRuntimeFromStub(basename)