MVC中Url中在？之前使用&，不能进入Route？

MVC中
(1): http://localhost/File/a&b.xls
这个的地址进入不了File/Index
(2): http://localhost/File/ab.xls可以
分析的原因：(1)中包含了&，有没有什么办法，在（1）地址不变的情况进入File/Index?
1，将&替换为%26经测试也不行。
求大神指点。

我在WebConfig中配置了

我的路由为
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.IgnoreRoute("Content/{*relpath}");
routes.IgnoreRoute("Images/{*relpath}");
routes.IgnoreRoute("Js/{*relpath}");
routes.IgnoreRoute("Scripts/{*relpath}");
routes.IgnoreRoute("ashx/{*relpath}");
routes.IgnoreRoute("fonts/{*relpath}");
routes.RouteExistingFiles = true;

        routes.MapRoute(
           "s3file1",
           "File/{intFilePathMapID}/{strFileName}",
           new { controller = "file", action = "S3", bIsAuditFolderPage = 0 },
           new { intFilePathMapID = "\\d+" }
        );

其他路由省略

将 & 替换为 %26
http://localhost/File/a%26b.xls

@cazhy
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.IgnoreRoute("Content/{*relpath}");
routes.IgnoreRoute("Images/{*relpath}");
routes.IgnoreRoute("Js/{*relpath}");
routes.IgnoreRoute("Scripts/{*relpath}");
routes.IgnoreRoute("ashx/{*relpath}");
routes.IgnoreRoute("fonts/{*relpath}");
routes.RouteExistingFiles = true;

        routes.MapRoute(
           "s3file1",
           "File/{intFilePathMapID}/{strFileName}",
           new { controller = "file", action = "S3", bIsAuditFolderPage = 0 },
           new { intFilePathMapID = "\\d+" }
        );

这是我的路由。

url路径中&好像是个特殊字符吧？楼主可以查一下