Merge XLT to XLSM Online for Free. Free Online XLT to XLSM Merger. Merge XLT to Word, ExCel, PPTX, PDF, JPG, HTML, ODS, SVG, XPS and more....Merge XLT to XLSM via C# High-speed C# library for merging XLT...platform independent software in C#. This is a professional software...