Data Loader is designed to load data into an Oracle database. Oracle does not offer a way of loading data directly into the database from a text-based or excel-based file. The only way to do this is to use SQL Loader, which needs to have specific control files written. Data Loader allows to pass the incoming data to a built-in oracle function or even a custom function.
Version 1.0.3 fixes a compatibility issue with Windows XP Pro with certain versions of dlls.