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Answers and rating deltas for

How can my Perl script determine whether an Excel file is in XLS or XLSX format?

Author Votes Δ
Alan Haggai Alavi 17 +1.06
Bruce Armstrong 14 +3.05
weismat 6 +0.35
CanSpice 2 -0.55
DVK 1 -0.87
Ivan Vučica -1 -2.66
Vivian River -2 -3.70
Last visited: Sep 14, 2014, 5:07:29 AM