Microsoft Web Api with string path parameter HTTP 404 when parameter contains "."

Question

I had my web api working fine, until a business rule obligates me to change a parameter from int to string. I knew that some bugs where expected but no this one:

    [ResponseType(typeof(UserDTO))]
    [HttpGet]
    [Route("api/users/{id}")]
    public IHttpActionResult GetUser(string id)
    {
        try
        {
            userValidator.secure(Request);
            User user = userValidator.GetUser(id);
            UserDTO userDTO = new UserDTO()
            {
                UserId = user.UserId,
                Name = user.Name,
                Admin = user.Admin,
                Deleted = user.Deleted
            };
            return Ok(userDTO);
        }
        catch (NotExistException exception)
        {
            return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.BadRequest, exception.Mymessage));
        }
        catch (System.Data.SqlClient.SqlException)
        {
            return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "VecinosUY no se puede conectar a la base de datos (∩︵∩)"));
        }
        catch (Exception exception) {
            return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, exception.Message));
        }

    }

HTTP get works fine if the string {id} doesn't contains a '.'

http://192.168.0.110:45455/api/users/facu works http://192.168.0.110:45455/api/users/facu.facu don't.

any work around for this problem ?