Registry Error in PowerPoint 2007

hi all. Today morning when i tried to open a presentation in my Power point 2007 i got a error message like this "You are attempting to open a file type that is blocked by your registry policy setting"

Is that any Registry Error or what ?

how can i open that presentation ?

This issue may occur if an administrator has restricted the types of presentations that you can open in Microsoft Office PowerPoint 2007. An administrator can set a registry key to restrict this functionality.

Anyways. you can open it through this steps:-

1. Click Start, click Run, type regedit in the Open box, and then click OK.
   
   
2. Locate and then click one of the following registry subkeys, as appropriate for your version of PowerPoint:
   HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\PowerPoint\Security\FileOpenBlock
   
   
3. After you select the subkey that is specified in step 3, locate the DWORD value. The "More Information" section describes the different DWORD values based on the version of PowerPoint.
   
   For example, if the opening of the .mht file type is restricted, locate the "HtmlFiles" DWORD value in the registry for the FileOpenBlock subkey. When you change the value data of "HtmlFiles" from 1 to 0, you can open the .mht files.
   
   
4. Right-click the DWORD value that you want, and then click Modify.
   
   
5. In the Value data box, type 0, and then click OK.
   
   
6. On the File menu, click Exit to exit Registry Editor.

To restrict the types of files that you can open or save in PowerPoint 2007, an administrator can use the 2007 Office System Administrative Templates to configure the registry on a client computer.