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You install the Microsoft Application Compatibility Toolkit (ACT) 5.0 on a Windows Vista Service Pack 1-based computer. However, when you try to open the Internet Explorer Compatibility Test Tool that is included with ACT 5.0, you receive the following error message:
Test Tool Error The file size exceeds the limit allowed and cannot be saved
When you open the Internet Explorer Compatibility Test Tool, the tool calls the GetOldestEventLogRecord function. If no events are logged in the Internet Explorer event log, an exception occurs in Windows Vista Service Pack 1.
To resolve this issue, apply the hotfix that is described in the following Microsoft Knowledge Base article:
950923 The SNMP Event Log Extension Agent does not initialize correctly on a computer that is running Windows Vista with Service Pack 1 or Windows Server 2008