diff --git a/dtool/src/dtoolutil/executionEnvironment.cxx b/dtool/src/dtoolutil/executionEnvironment.cxx
index 9be916ea92..a9139a050b 100644
--- a/dtool/src/dtoolutil/executionEnvironment.cxx
+++ b/dtool/src/dtoolutil/executionEnvironment.cxx
@@ -203,8 +203,6 @@ ns_get_environment_variable(const string &var) const {
     return Filename::get_home_directory().to_os_specific();
   } else if (var == "TEMP") {
     return Filename::get_temp_directory().to_os_specific();
-  } else if (var == "APP") {
-    return Filename::get_app_directory().to_os_specific();
   } else if (var == "USER_APPDATA") {
     return Filename::get_user_appdata_directory().to_os_specific();
   } else if (var == "COMMON_APPDATA") {
diff --git a/dtool/src/dtoolutil/filename.cxx b/dtool/src/dtoolutil/filename.cxx
index a2ff30ac9e..0bbe1b92ba 100644
--- a/dtool/src/dtoolutil/filename.cxx
+++ b/dtool/src/dtoolutil/filename.cxx
@@ -51,7 +51,6 @@
 
 Filename *Filename::_home_directory;
 Filename *Filename::_temp_directory;
-Filename *Filename::_app_directory;
 Filename *Filename::_user_appdata_directory;
 Filename *Filename::_common_appdata_directory;
 TypeHandle Filename::_type_handle;
@@ -561,52 +560,6 @@ get_temp_directory() {
   return (*_temp_directory);
 }
 
-////////////////////////////////////////////////////////////////////
-//     Function: Filename::get_app_directory
-//       Access: Published
-//  Description: Returns a path to the current application's
-//               directory, as nearly as this can be determined.
-////////////////////////////////////////////////////////////////////
-const Filename &Filename::
-get_app_directory() {
-  if (AtomicAdjust::get_ptr(_app_directory) == NULL) {
-    Filename app_directory;
-
-#if defined(IS_OSX)
-    app_directory = get_osx_app_directory();
-
-#endif  // WIN32
-
-    if (app_directory.empty()) {
-      // Fallback case.
-      Filename binary_name = ExecutionEnvironment::get_binary_name();
-      if (!binary_name.empty()) {
-        app_directory = binary_name.get_dirname();
-      }
-    }
-    if (app_directory.empty()) {
-      // Another fallback.
-      Filename dtool_name = ExecutionEnvironment::get_dtool_name();
-      if (!dtool_name.empty()) {
-        app_directory = dtool_name.get_dirname();
-      }
-    }
-    if (app_directory.empty()) {
-      // The final fallback.
-      app_directory = ExecutionEnvironment::get_cwd();
-    }
-
-    Filename *newdir = new Filename(app_directory);
-    if (AtomicAdjust::compare_and_exchange_ptr((void * TVOLATILE &)_app_directory, NULL, newdir) != NULL) {
-      // Didn't store it.  Must have been stored by someone else.
-      assert(_app_directory != NULL);
-      delete newdir;
-    }
-  }
-
-  return (*_app_directory);
-}
-
 ////////////////////////////////////////////////////////////////////
 //     Function: Filename::get_user_appdata_directory
 //       Access: Published
diff --git a/dtool/src/dtoolutil/filename.h b/dtool/src/dtoolutil/filename.h
index 585fb05896..167164866d 100644
--- a/dtool/src/dtoolutil/filename.h
+++ b/dtool/src/dtoolutil/filename.h
@@ -86,7 +86,6 @@ PUBLISHED:
 
   static const Filename &get_home_directory();
   static const Filename &get_temp_directory();
-  static const Filename &get_app_directory();
   static const Filename &get_user_appdata_directory();
   static const Filename &get_common_appdata_directory();
 
@@ -234,7 +233,6 @@ protected:
 
   static Filename *_home_directory;
   static Filename *_temp_directory;
-  static Filename *_app_directory;
   static Filename *_user_appdata_directory;
   static Filename *_common_appdata_directory;
 
diff --git a/dtool/src/dtoolutil/filename_assist.h b/dtool/src/dtoolutil/filename_assist.h
index ae33a1c1c7..49eab4472c 100644
--- a/dtool/src/dtoolutil/filename_assist.h
+++ b/dtool/src/dtoolutil/filename_assist.h
@@ -23,7 +23,6 @@
 
 string get_osx_home_directory();
 string get_osx_temp_directory();
-string get_osx_app_directory();
 string get_osx_user_appdata_directory();
 string get_osx_common_appdata_directory();
 
diff --git a/dtool/src/dtoolutil/filename_assist.mm b/dtool/src/dtoolutil/filename_assist.mm
index 40c134b844..7e93893de6 100644
--- a/dtool/src/dtoolutil/filename_assist.mm
+++ b/dtool/src/dtoolutil/filename_assist.mm
@@ -81,29 +81,6 @@ get_osx_home_directory() {
   return result;
 }
 
-////////////////////////////////////////////////////////////////////
-//     Function: get_osx_app_directory
-//  Description: 
-////////////////////////////////////////////////////////////////////
-string
-get_osx_app_directory() {
-#ifndef BUILD_IPHONE
-  NSApplicationLoad();
-#endif
-
-  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
-
-  string result;
-  NSBundle *bundle = [NSBundle mainBundle];
-  if (bundle != nil) {
-    NSString *dir = [bundle bundlePath];
-    result = NSString_to_cpp_string(dir);
-  }
-  [pool release]; 
-
-  return result;
-}
-
 ////////////////////////////////////////////////////////////////////
 //     Function: get_NSCachesDirectory
 //  Description: