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I found the commented out setting in web.config file to enable 404 page for non aspx files, but it doesn't seem to work as expected on IIS 7.5. I get 500 Internal Server Error when I use it. Any idea?
Found here here: http://www.mojoportal.com/Forums/Thread.aspx?pageid=5&mid=34&ItemID=7&thread=9939&pagenumber=1
I changed your web.config setting from
<httpErrors errorMode="DetailedLocalOnly" defaultResponseMode="ExecuteURL" defaultPath="Error.htm">
and it worked...