G'day stevieb,

For XLSX (Excel 2007 Open XML XLSX format), I've successfully used Spreadsheet::ParseXLSX.

For the older XLS format: Spreadsheet::ParseExcel.

After instantiation and calling the parse() method, use of these two modules is virtually identical. Most of the documentation is in Spreadsheet::ParseExcel but do see Spreadsheet::ParseXLSX for a few differences.