Zantax, I've been a geek now for well over 25 years, and to my knowledge, Excel has nothing to do with choosing the default PDF handler. I use Excel 2010 extensively for projects at work and wrote up a quick and dirty VBA Sub to print to PDF via Excel... Might not help you at all, but feel free to try:
Don't know if it's going to help you at all, but I'm pretty sure that these functions work with 2007. You'll need to point a macro to this sub, maybe make a button for yourself, but that's it...
Hope this helps!
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