diff --git a/direct/src/plugin_standalone/p3dEmbed.cxx b/direct/src/plugin_standalone/p3dEmbed.cxx
index ac19baacc6..4ee1ff31ca 100644
--- a/direct/src/plugin_standalone/p3dEmbed.cxx
+++ b/direct/src/plugin_standalone/p3dEmbed.cxx
@@ -112,8 +112,10 @@ run_embedded(streampos read_offset, int argc, char *argv[]) {
         // Read out the tokens that may interest us
         if (keyword == "width") {
           _win_width = atoi(value.c_str());
+          _got_win_size = true;
         } else if (keyword == "height") {
           _win_height = atoi(value.c_str());
+          _got_win_size = true;
         } else if (keyword == "log_basename") {
           _log_basename = value;
         } else if (keyword == "root_dir") {
@@ -233,9 +235,7 @@ run_embedded(streampos read_offset, int argc, char *argv[]) {
   }
   
   // Create a plugin instance and run the program
-  P3D_instance *inst = create_instance
-    (f, true, _win_x, _win_y, _win_width, _win_height,
-     argv, argc, read_offset);
+  P3D_instance *inst = create_instance(f, true, argv, argc, read_offset);
   _instances.insert(inst);
   
   run_main_loop();
diff --git a/direct/src/plugin_standalone/panda3d.cxx b/direct/src/plugin_standalone/panda3d.cxx
index 15e7d0d1fb..97fecbc186 100644
--- a/direct/src/plugin_standalone/panda3d.cxx
+++ b/direct/src/plugin_standalone/panda3d.cxx
@@ -120,6 +120,7 @@ run_command_line(int argc, char *argv[]) {
         cerr << "Invalid value for -s: " << optarg << "\n";
         return 1;
       }
+      _got_win_size = true;
       break;
 
     case 'o':
@@ -248,8 +249,11 @@ run_command_line(int argc, char *argv[]) {
       int num_y_spans = int(sqrt((double)num_instance_filenames));
       int num_x_spans = (num_instance_filenames + num_y_spans - 1) / num_y_spans;
       
-      int inst_width = _win_width / num_x_spans;
-      int inst_height = _win_height / num_y_spans;
+      int origin_x = _win_x;
+      int origin_y = _win_y;
+      _win_width = _win_width / num_x_spans;
+      _win_height = _win_height / num_y_spans;
+      _got_win_size = true;
       
       for (int yi = 0; yi < num_y_spans; ++yi) {
         for (int xi = 0; xi < num_x_spans; ++xi) {
@@ -259,12 +263,11 @@ run_command_line(int argc, char *argv[]) {
           }
           
           // Create instance i at window slot (xi, yi).
-          int inst_x = _win_x + xi * inst_width;
-          int inst_y = _win_y + yi * inst_height;
+          _win_x = origin_x + xi * _win_width;
+          _win_y = origin_y + yi * _win_height;
           
           P3D_instance *inst = create_instance
             (instance_filenames[i], true,
-             inst_x, inst_y, inst_width, inst_height,
              instance_args, num_instance_args);
           _instances.insert(inst);
         }
@@ -275,7 +278,6 @@ run_command_line(int argc, char *argv[]) {
       for (int i = 0; i < num_instance_filenames; ++i) {
         P3D_instance *inst = create_instance
           (instance_filenames[i], true, 
-           _win_x, _win_y, _win_width, _win_height,
            instance_args, num_instance_args);
         _instances.insert(inst);
       }
diff --git a/direct/src/plugin_standalone/panda3dBase.cxx b/direct/src/plugin_standalone/panda3dBase.cxx
index d47a3e5f4d..2d5e796e7a 100644
--- a/direct/src/plugin_standalone/panda3dBase.cxx
+++ b/direct/src/plugin_standalone/panda3dBase.cxx
@@ -24,6 +24,8 @@
 #include "find_root_dir.h"
 #include "load_plugin.h"
 #include "executionEnvironment.h"
+#include "multifile.h"
+#include "tinyxml.h"
 
 // We can include this header file to get the DTOOL_PLATFORM
 // definition, even though we don't link with dtool.
@@ -62,6 +64,7 @@ Panda3DBase(bool console_environment) {
   _win_y = -1;
   _win_width = 640;
   _win_height = 480;
+  _got_win_size = false;
 
   _exit_with_last_instance = true;
   _host_url = PANDA_PACKAGE_HOST_URL;
@@ -330,7 +333,6 @@ make_parent_window() {
 ////////////////////////////////////////////////////////////////////
 P3D_instance *Panda3DBase::
 create_instance(const string &p3d, bool start_instance,
-                int win_x, int win_y, int win_width, int win_height,
                 char **args, int num_args, const int &p3d_offset) {
   // Check to see if the p3d filename we were given is a URL, or a
   // local file.
@@ -346,6 +348,9 @@ create_instance(const string &p3d, bool start_instance,
     p3d_filename.make_absolute();
     os_p3d_filename = p3d_filename.to_os_specific();
   } 
+  if (is_local) {
+    read_p3d_info(p3d_filename);
+  }
 
   // Build up the token list.
   Tokens tokens = _tokens;
@@ -373,7 +378,7 @@ create_instance(const string &p3d, bool start_instance,
   token._value = "1";
   tokens.push_back(token);
 
-  P3D_token *tokens_p;
+  P3D_token *tokens_p = NULL;
   size_t num_tokens = tokens.size();
   if (!tokens.empty()) {
     tokens_p = &tokens[0];
@@ -400,7 +405,7 @@ create_instance(const string &p3d, bool start_instance,
     }
 
     P3D_instance_setup_window_ptr
-      (inst, _window_type, win_x, win_y, win_width, win_height, &_parent_window);
+      (inst, _window_type, _win_x, _win_y, _win_width, _win_height, &_parent_window);
   }
 
   return inst;
@@ -432,6 +437,56 @@ delete_instance(P3D_instance *inst) {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: Panda3DBase::read_p3d_info
+//       Access: Protected
+//  Description: Opens the p3d file to read the p3d_info.xml file
+//               within it, looking for any locally-relevant
+//               parameters (like win-size).
+////////////////////////////////////////////////////////////////////
+bool Panda3DBase::
+read_p3d_info(const Filename &p3d_filename) {
+  PT(Multifile) mf = new Multifile;
+  if (!mf->open_read(p3d_filename)) {
+    return false;
+  }
+  int si = mf->find_subfile("p3d_info.xml");
+  if (si == -1) {
+    return false;
+  }
+
+  string p3d_info;
+  mf->read_subfile(si, p3d_info);
+  istringstream strm(p3d_info);
+  TiXmlDocument doc;
+  strm >> doc;
+  if (strm.fail() && !strm.eof()) {
+    return false;
+  }
+  TiXmlElement *xpackage = doc.FirstChildElement("package");
+  if (xpackage == NULL) {
+    return false;
+  }
+  TiXmlElement *xconfig = xpackage->FirstChildElement("config");
+  if (xconfig == NULL) {
+    return false;
+  }
+
+  // Successfully read the p3d_info.xml file.
+  if (!_got_win_size) {
+    // If the user didn't override the size on the command line, allow
+    // the p3d file to request a preferred size.
+    if (xconfig->Attribute("width", &_win_width)) {
+      _got_win_size = true;
+    }
+    if (xconfig->Attribute("height", &_win_height)) {
+      _got_win_size = true;
+    }
+  }
+
+  return true;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: Panda3DBase::parse_token
 //       Access: Protected
diff --git a/direct/src/plugin_standalone/panda3dBase.h b/direct/src/plugin_standalone/panda3dBase.h
index 87d886e2bd..0adf962f39 100755
--- a/direct/src/plugin_standalone/panda3dBase.h
+++ b/direct/src/plugin_standalone/panda3dBase.h
@@ -49,10 +49,10 @@ protected:
 
   P3D_instance *
   create_instance(const string &p3d, bool start_instance,
-                  int win_x, int win_y, int win_width, int win_height,
                   char **args, int num_args, const int &p3d_offset = 0);
   void delete_instance(P3D_instance *instance);
 
+  bool read_p3d_info(const Filename &p3d_filename);
   bool parse_token(const char *arg);
   bool parse_int_pair(const char *arg, int &x, int &y);
   string lookup_token(const string &keyword) const;
@@ -84,6 +84,7 @@ protected:
   P3D_window_handle _parent_window;
   int _win_x, _win_y;
   int _win_width, _win_height;
+  bool _got_win_size;
   bool _exit_with_last_instance;
 
   bool _reporting_download;
diff --git a/direct/src/plugin_standalone/panda3dMac.cxx b/direct/src/plugin_standalone/panda3dMac.cxx
index b35017344c..f07a477830 100644
--- a/direct/src/plugin_standalone/panda3dMac.cxx
+++ b/direct/src/plugin_standalone/panda3dMac.cxx
@@ -58,10 +58,7 @@ open_p3d_file(FSRef *ref) {
   }
 
   // Create an instance.
-  P3D_instance *inst = create_instance
-    ((char *)filename, true,
-     _win_x, _win_y, _win_width, _win_height,
-     NULL, 0);
+  create_instance((char *)filename, true, NULL, 0);
 }
 
 static pascal OSErr