If you are using IIS 7 (Windows 2008 / Vista or higher), you can use the IIS URL rewrite module from http://www.iis.net/download/URLRewrite
web.config, IIS.
, URLS .
mysite.com/shop/package-one mysite.com/shop/default.aspx?package=package-one
<rewrite>
<rules>
<rule name="ShopPackages" stopProcessing="true">
<match url="^shop/(.*)"/>
<conditions>
<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true"/>
</conditions>
<action type="Rewrite" url="/shop/default.aspx?package={R:1}" appendQueryString="false"/>
</rule>
</rules>
</rewrite>