Rendering .xls Excel files

Question

I'm currently writing an application that compiles a lot of information to PDF, including Excel files. I was hoping to find some way of rendering an Excel spreadsheet without using Excel. Let me explain: All the products out there that print Excel to PDF, export Excel sheets to JPEG or BMP, export Excel sheets to PDF, display Excel sheets on the monitor, etc... or in ANY way try to render an Excel sheet use Excel to do it. In other words, no program tries to guess what the Excel sheet looks like without physically using MS Excel to tell it what the sheet looks like. I was wondering if anyone knew an exception to this rule. Is there anything out there that can render an Excel sheet as a graphic, PDF, or anything else that does not use Excel to tell it how to draw this image?