Nice solution for powerpoint.

For Excel, though, I'd recommend using SpreadSheet::WriteExcel (by jmcnamara) instead, though. It's much simpler to use, and the system the script runs on doesn't need Excel installed. In fact, it doesn't even need to have Windows installed; I generate spreadsheets from unix systems every day.

For word files, there are a few different RTF generators available, which also won't require Word to be installed on the system doing the generating. RTF::Document looks a bit simpler to use than RTF::Writer, but I haven't played with either much.
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Mike