diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 12819a1490238090ae6ff75c11d68a2171fc42be..1e51ba6260948a4d7a8546f37d971fa67393d251 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -6,6 +6,7 @@ Wysiwyg x.x-x.x, xxxx-xx-xx
 
 Wysiwyg 6.x-2.x, xxxx-xx-xx
 ---------------------------
+#752516 by nquocbao, sun: Fixed file stream warnings in version callbacks.
 
 
 Wysiwyg 6.x-2.1, 2010-03-08
diff --git a/editors/ckeditor.inc b/editors/ckeditor.inc
index 696b2cf0074d1c0d72bcba6bfaafa5374151b974..f9eade91a81e65b111029fdb2e63983ed3635e8b 100644
--- a/editors/ckeditor.inc
+++ b/editors/ckeditor.inc
@@ -60,6 +60,9 @@ function wysiwyg_ckeditor_editor() {
  */
 function wysiwyg_ckeditor_version($editor) {
   $library = $editor['library path'] . '/ckeditor.js';
+  if (!file_exists($library)) {
+    return;
+  }
   $library = fopen($library, 'r');
   $max_lines = 8;
   while ($max_lines && $line = fgets($library, 140)) {
diff --git a/editors/fckeditor.inc b/editors/fckeditor.inc
index 4243eb9211129a545542880ed91b3b9f5cc2bc68..f3a1b02c56122a91b67b1971464a65bdbd3f81cd 100644
--- a/editors/fckeditor.inc
+++ b/editors/fckeditor.inc
@@ -52,6 +52,9 @@ function wysiwyg_fckeditor_editor() {
  */
 function wysiwyg_fckeditor_version($editor) {
   $library = $editor['library path'] . '/fckeditor.js';
+  if (!file_exists($library)) {
+    return;
+  }
   $library = fopen($library, 'r');
   $max_lines = 100;
   while ($max_lines && $line = fgets($library, 60)) {
diff --git a/editors/jwysiwyg.inc b/editors/jwysiwyg.inc
index 3c810e51679edfae08e3d1082ba28abb709f800f..6327ade5111207f5c0e20f8d7cab8d291d9f6f31 100644
--- a/editors/jwysiwyg.inc
+++ b/editors/jwysiwyg.inc
@@ -48,6 +48,9 @@ function wysiwyg_jwysiwyg_editor() {
  */
 function wysiwyg_jwysiwyg_version($editor) {
   $script = $editor['library path'] . '/jquery.wysiwyg.js';
+  if (!file_exists($script)) {
+    return;
+  }
   $script = fopen($script, 'r');
   fgets($script);
   $line = fgets($script);
diff --git a/editors/markitup.inc b/editors/markitup.inc
index eb4254ed014c6cb28ae2d280e82d2e9b5c65dbff..944f6ce1591ee9123fa6d8773c4854727fe8420a 100644
--- a/editors/markitup.inc
+++ b/editors/markitup.inc
@@ -49,6 +49,9 @@ function wysiwyg_markitup_editor() {
  */
 function wysiwyg_markitup_version($editor) {
   $changelog = $editor['library path'] . '/readme.txt';
+  if (!file_exists($changelog)) {
+    return;
+  }
   $changelog = fopen($changelog, 'r');
   $line = fgets($changelog);
   if (preg_match('@([0-9\.]+)@', $line, $version)) {
diff --git a/editors/openwysiwyg.inc b/editors/openwysiwyg.inc
index 152873bf26b6a1241338929981bdc760b41b4eb4..7f77baae994c915d295234f270542f50ecb6dad5 100644
--- a/editors/openwysiwyg.inc
+++ b/editors/openwysiwyg.inc
@@ -45,7 +45,10 @@ function wysiwyg_openwysiwyg_editor() {
  *   The installed editor version.
  */
 function wysiwyg_openwysiwyg_version($editor) {
-  $changelog = $editor['editor path'] . '/changelog';
+  $changelog = $editor['library path'] . '/changelog';
+  if (!file_exists($changelog)) {
+    return;
+  }
   $changelog = fopen($changelog, 'r');
   $line = fgets($changelog, 20);
   if (preg_match('@v([\d\.]+)@', $line, $version)) {
diff --git a/editors/tinymce.inc b/editors/tinymce.inc
index d4423fd335cbf14281e740310573c7fcc0b18142..55f6ce3aed277857f53b885563c7772755cbcf8d 100644
--- a/editors/tinymce.inc
+++ b/editors/tinymce.inc
@@ -82,6 +82,9 @@ function wysiwyg_tinymce_editor() {
  */
 function wysiwyg_tinymce_version($editor) {
   $script = $editor['library path'] . '/tiny_mce.js';
+  if (!file_exists($script)) {
+    return;
+  }
   $script = fopen($script, 'r');
   // Version is contained in the first 100 chars.
   $line = fgets($script, 100);
diff --git a/editors/whizzywig.inc b/editors/whizzywig.inc
index 6442c9b651edbfe334471d5eaf1da3a91b96595b..9ad9f6f7814828f5541670cab6eaf412840c0a6a 100644
--- a/editors/whizzywig.inc
+++ b/editors/whizzywig.inc
@@ -46,6 +46,9 @@ function wysiwyg_whizzywig_editor() {
  */
 function wysiwyg_whizzywig_version($editor) {
   $script = $editor['library path'] . '/whizzywig.js';
+  if (!file_exists($script)) {
+    return;
+  }
   $script = fopen($script, 'r');
   $line = fgets($script, 43);
   if (preg_match('@Whizzywig v([0-9]+)@', $line, $version)) {
diff --git a/editors/wymeditor.inc b/editors/wymeditor.inc
index 47d21cf6272cc37253cd98d5cfa1db3c73fff11b..77b88c2601b39506d13b064c0f4d4b6ced85302e 100644
--- a/editors/wymeditor.inc
+++ b/editors/wymeditor.inc
@@ -53,6 +53,9 @@ function wysiwyg_wymeditor_editor() {
  */
 function wysiwyg_wymeditor_version($editor) {
   $script = $editor['library path'] . '/jquery.wymeditor.js';
+  if (!file_exists($script)) {
+    return;
+  }
   $script = fopen($script, 'r');
   fgets($script);
   $line = fgets($script);
diff --git a/editors/yui.inc b/editors/yui.inc
index b2cb56e8c53958b82c8ec8cb1549ef477c20d5cc..258803b270f0f0c70c01baf1ab259e2f70519328 100644
--- a/editors/yui.inc
+++ b/editors/yui.inc
@@ -66,6 +66,9 @@ function wysiwyg_yui_editor() {
  */
 function wysiwyg_yui_version($editor) {
   $library = $editor['library path'] . '/editor/editor.js';
+  if (!file_exists($library)) {
+    return;
+  }
   $library = fopen($library, 'r');
   $max_lines = 10;
   while ($max_lines && $line = fgets($library, 60)) {