MVC4 路由参数带点 文件名后缀导致错误

public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            //office web apps
            config.Routes.MapHttpRoute(
                 name: "Contents",
                 routeTemplate: "wopi/files/{name}/contents",
                 defaults: new { controller = "files", action = "GetFile" }
             );
            config.Routes.MapHttpRoute(
                name: "FileInfo",
                routeTemplate: "api/wopi/files/{name}",
                defaults: new { controller = "files", action = "GetFileInfo", name = RouteParameter.Optional }
            );
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            // 取消注释下面的代码行可对具有 IQueryable 或 IQueryable<T> 返回类型的操作启用查询支持。
            // 若要避免处理意外查询或恶意查询，请使用 QueryableAttribute 上的验证设置来验证传入查询。
            // 有关详细信息，请访问 http://go.microsoft.com/fwlink/?LinkId=279712。
            //config.EnableQuerySupport();
        }
    }

public class filesController : ApiController
    {
        public CheckFileInfo GetFileInfo(string name, string access_token)
        {

            string _access_token = access_token;

            var file = HostingEnvironment.MapPath("~/App_Data/" + name);//从硬盘中获取name文件

            FileInfo info = new FileInfo(file);
            if (!info.Exists) return null;//不存在返回
            var hasher = SHA256.Create();
            byte[] hashValue;
            using (Stream s = File.OpenRead(file))
            {
                hashValue = hasher.ComputeHash(s);
            }
            string sha256 = Convert.ToBase64String(hashValue);
            var json = new CheckFileInfo

            {

                BaseFileName = info.Name,//"test.docx",

                OwnerId = "admin",

                Size = info.Length,

                SHA256 = "+17lwXXN0TMwtVJVs4Ll+gDHEIO06l+hXK6zWTUiYms=",

                Version = "GIYDCMRNGEYC2MJREAZDCORQGA5DKNZOGIZTQMBQGAVTAMB2GAYA===="

            };

            return json;

        }
        public HttpResponseMessage GetFile(string name, string access_token)
        {

            try
            {

                string _access_token = access_token;

                var file = HostingEnvironment.MapPath("~/App_Data/" + name);//name是文件名

                var rv = new HttpResponseMessage(HttpStatusCode.OK);

                var stream = new FileStream(file, FileMode.Open, FileAccess.Read);

                rv.Content = new StreamContent(stream);

                rv.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

                return rv;

            }

            catch (Exception ex)
            {

                var rv = new HttpResponseMessage(HttpStatusCode.InternalServerError);

                var stream = new MemoryStream(UTF8Encoding.Default.GetBytes(ex.Message ?? ""));

                rv.Content = new StreamContent(stream);

                return rv;

            }

        }
    }

<system.webServer>
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0"
           path="*."
           verb="*"
           type="System.Web.Handlers.TransferRequestHandler"
           preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
    <modules runAllManagedModulesForAllRequests="true" />
  </system.webServer>