contains an extension that is five or more characters long.
For example, abcde causes the problem if the registry value is the following:
Microsoft Jet 4.0 Service Pack 3 (SP3) or Service Pack 4 (SP4) is installed, or you are running Microsoft Windows 2000.
To resolve this problem, install the latest Jet 4.0 service pack. For additional information about how to obtain and install the latest Jet 4.0 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
239114 How To: Obtain the Latest Service Pack for the Microsoft Jet 4.0 Database Engine
To work around this problem, use only the first four characters of any file name extensions in the DisabledExtensions registry value. For example, if abcde appears in the list of file name extensions
change the registry value to:!txt,csv,tab,asc,htm,html,abcd
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first fixed in Jet 4.0 SP6.
This problem results from changes made to address the security issue described in the following Microsoft Knowledge Base article:
239471 Jet 4.0 Text IISAM Allows Users to Append Lines to System Files