ASP.net URL rewriting conflicts with image folder?

I have the rules:

<rewrite url="~/construct2" to="~/construct2.aspx" processing="stop"/>
<rewrite url="~/construct" to="~/Handlers/PermRedirect.ashx?URL=construct2" processing="stop"/>

Along with many many more.

When I attempt to visit:

http://84.45.57.142/images/construct2-screenshot.jpg

It seems to activate these 开发者_JS百科rules and redirect you to construct2.aspx. Does anyone know why? I thought ~/construct would only match root directory/construct not any directory/construct*

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Try:

<rewrite url="~/construct2$" to="~/construct2.aspx" processing="stop"/>