cfspreadsheet 400000 lines

How to read an Excel file ".xlsx" of 420 000 lines ?

I used cfspreadsheet but,

over 4000 lines  it fails, saying nothing.

I tried the CFC (custom tag) : POIutility.cfc from Ben Nadel.

but it seems it does not work with xlsx,

does work fine with ".xls" , I can read 65 000 lines

because ".xls" it limited to 65 000 lines.

so I have no solution to read 400 000 :lines.

Thanks for help. ideas ?

Pierre.