Hi Sander, we’re using the Excel importer module to import Excel documents. This module has all the mapping configuration available by default, but only supports Excel documents as input. So we added an additional component to convert a .CSV or .TXT files into Excel.
Maybe that strategy suits you better or?
Have a look at the flat file importer, this allows you to import the files by creating a configuration taht allows for skipping columns. See https://marketplace.mendix.com/link/component/429