The AspEnableAspHtmlFallback property controls the behavior of ASP when a new request is to be rejected due to a full request queue. A true value for this property will cause an .htm file with a similar name as the requested .asp file, if it exists, to be sent instead of the .asp file. The naming convention for the .htm file is the name of the .asp file with _asp appended. For example, if the .asp file is hello.asp, then the .htm file should be hello_asp.htm
This property is a process-level property.
You can configure this property at the following locations in the IIS metabase.
IIS Admin Object Type
Client: Requires Windows XP Professional, Windows 2000 Professional, or Windows NT Workstation 4.0.
Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.