In the application, identify the objects in framefile. Suppose if one the abjects is custom object, you map custom object to standard object. Even after mappiing the custom object to standard object if the silktest does not idenify the object. What is the solution for this?

First you have to try by enabling various extensions so that the application could be recognized....Even if not possible, the last option is co-ordinates.....but these are not very much reliable unless done properly.....