the simplest tool for this is at http://jplamontre.free.fr/AS400/SQL2SYLK.htm
it produces in the IFS an excel file in SYLK format
the second level permits some customizing (you put what you need in each cell, apply some style) :
the third level is an Excel-2003 sheet in xml format.
I have implemented sheets, cells and formatting. (not pivot table, …)
these 3 tools are commented and sampled