Spreadsheet::Read tries to transparently read *any* spreadsheet and return
its content in a universal manner independent of the parsing module that
does the actual spreadsheet scanning.

For OpenOffice this module uses Spreadsheet::ReadSXC

For Microsoft Excel this module uses Spreadsheet::ParseExcel or
Spreadsheet::XLSX

For CSV this module uses Text::CSV_XS (0.29 or up required, 0.73 or up
preferred) or Text::CSV_PP (1.05 or up required).

For SquirrelCalc there is a very simplistic built-in parser