In 'Tabellen zum Bearbeiten v Muse-idf-Dateien' you find open-documend-spreadsheets (ods) used by LibreOffice or OpenOffice, to create lines for the idf-files. Idfs are xml-files can be red by MusE. So you can use a simple .TXT-file-editor to edit them, but keep the syntax.
! I created these files for myself, so they are in german. So don't be worry, the few words are not hard to learn and you can translate it. It's only one of 290 other languages on this planet :) !