A Google search brings up a few results dealing with this very module. One from October suggests: 
# If the next tests give warnings like
# Character in 'C' format wrapped in pack at
#    /usr/local/perl/5.8.8/lib/site_perl/5.8.8/Spreadsheet/ParseExcel/
+FmtDefault.pm line 68
# Change C* to U* in line 68

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In reply to Re^3: Excel to XML issue with Spreadsheet::ParseExcel by eff_i_g
in thread Excel to XML issue with Spreadsheet::ParseExcel by stonecolddevin

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