You may be prompted for user credentials when you open your PowerPoint 2002 presentation the first time in Internet Explorer from an FTP site (839644)

WORKAROUND

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To avoid receiving the prompt for user credentials the first time that you open a PowerPoint 2002 presentation in Internet Explorer, add the appropriate FTP root URL to the Internet subkey in the registry. To do this, follow these steps:

1. Quit PowerPoint 2002.
2. Click Start, and then click Run.
3. In the Open box, type regedit, and then click OK.
4. Locate and then click to select the following registry subkey:

   HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Common\Internet

5. After you select the key that is specified in step 4, point to New on the Edit menu, and then click Key.
6. Type FTP Sites, and then press ENTER.
7. With the FTP Sites subkey that you created in steps 5 and 6 selected, point to New on the Edit menu, and then click Key.
8. Type site_0, and then press ENTER.
   
   Note You can add multiple subkeys for various ftp sites such as site_1, site_2, and site_3.
9. With the subkey that you created in step 8 selected, point to New on the Edit menu, and then click String Value.
10. Type Site Name, and then press ENTER.
11. Right-click Site Name, and then click Modify.
12. In the Value data box, type the FTP site URL such as ftp://SiteURL, and then click OK.
    
    Note In this example, SiteURL is the FTP address where you open your PowerPoint 2002 presentation.
13. On the File menu, click Exit to quit Registry Editor.

After you set the registry key, you will be prompted again for credentials. After that, you will no longer be prompted for credentials.