You receive this error message when a user opens a PPT from a customer: the type of file you are trying to open is blocked by the registry policy setting.
This issue is a compatibility issue. Follow the KB action:
In fact, the change of one of the registry entries is successful, there is no need to change both.
1. Quit PowerPoint 2003.
2. Click Start, click Run, type regedit in the Open box, and then click OK.
3. Locate and click one of the following registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common
Hkey_current_user\software\policies\microsoft\office\11.0\common
4. On the Edit menu, point to New, and then click Items.
5. Type oiceexemptions for the name of the item.
6. On the Edit menu, point to New, and then click String Value.
7. Type a string name, and then press Enter. For example, type Exemptdirectory.
8. Right-click the string name you typed in step 7, and then click Modify.
9. In the Value data box, type the path to the directory that contains the appropriate file, and then click OK. For example, if your document is in the C:\My Documents folder, type C:\My documents in the Value data box.
Note: You must create a folder. Does not automatically exempt any subfolders. For all other folders that you want to exempt, repeat steps 6 through 9 by creating string values such as "ExemptDirectory1" and "ExemptDirectory2".
10. On the File menu, click Exit to exit the Registry Editor.
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