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  • $\begingroup$ Thanks a lot for your answer. Do you have a sense of why this is working for *.xls but not for *.xlsx ? $\endgroup$ Commented Oct 16, 2012 at 7:04
  • $\begingroup$ I can't honestly say why one format works. .xlsx should be able to support $2^{20}$ entries, which is even more than its .xls predecessor, but if I had to hazard a guess, I'd say that Mathematica's Export function is at fault here. In the docs the suggested spreadsheet extension is .xls, so perhaps the Export function was built around that. $\endgroup$ Commented Oct 16, 2012 at 14:56