Handling Excel files in NAV 2013 (including R2) is not as easy as it seems at first. The Excel Buffer table – an obvious choice of the old days – supports only Open XML format (*.xlsx), and Excel Interoperability implementation seems a bit buggy (check the comments in my old post about .NET interoperability: https://vjeko.com/blog/the-beauty-and-the-beast-nav-and-net ).
