Index: branches/version-2_5-dev/data/class/pages/admin/contents/LC_Page_Admin_Contents_FileView.php
===================================================================
--- branches/version-2_5-dev/data/class/pages/admin/contents/LC_Page_Admin_Contents_FileView.php	(revision 20345)
+++ branches/version-2_5-dev/data/class/pages/admin/contents/LC_Page_Admin_Contents_FileView.php	(revision 20417)
@@ -124,9 +124,7 @@
         );
 
-        // 拡張子取得
-        $arrResult = split('\.', $objFormParam->getValue('file'));
-        $ext = $arrResult[count($arrResult)-1];
+        $extension = pathinfo($objFormParam->getValue('file'), PATHINFO_EXTENSION);
 
-        if (!preg_match('|\./|', $file) && in_array($ext, $arrViewFile)) {
+        if (!preg_match('|\./|', $file) && in_array($extension, $arrViewFile)) {
             $file_check_flg = true;
         }