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+Some .CHM files may not render properly on Windows XP, Windows Vista and Windows 7.\r
+\r
+When attempting to open a Compiled HTML Help (.CHM) file, the file may open but display one of the following messages instead of the expected content:\r
+\r
+ * Navigation to the webpage was canceled.\r
+ * Action canceled.\r
+ \r
+To resolve this issue, carry out the following steps:\r
+\r
+ 1. Right-click the .CHM file and choose Properties\r
+ 2. On the General tab, click the button labeled "Unblock"\r
+ 3. Click OK\r
+\r
+For further information in this issue, refer to the following Microsoft articles. \r
+\r
+For Windows XP\r
+http://support.microsoft.com/kb/902225\r
+\r
+For Windows Vista and Windows 7\r
+http://support.microsoft.com/kb/2021383
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