Build a Datamap viewer

Hi We work on a product related to Customer communications management, where all the desingn data mapping are done and taken care. Now we need to build a separate data file mapping viewer as a stand alone viewer which takes the mapping done in the existing another interface and need to show the given data file with the mappng later. This helps in real time that any production data file misses out the unstructured data from mapped data, it shall easily identify by using this application. The previous product uses VB script. So the same is believed to be more compatible.