Problem opening xls. files

I take an online college course and have recently found that when people attach xls. files I can't read them as an octet file comes up which I can't open. I have Office 2007 which has xlsx files for excel.
What is weird is that if I go into my account via explorer instead of mozilla I can open the file. The only thing I can think of is that it is a glitch of the current update.
Please help, I don't want to have to log on to explorer everytime I want to open a 2003 version of excel.

I have I-work 09 [Pages 4.0 (727)]
This is the same version I had before (I think) -- At the Apple Store they used a new I-Work disc to install it onto the new hard drive.
I hope someone can help with this!
Thank you!

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