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Gnumeric is the Spreadsheet Companion to Abiword and has recently been ported to win32. The download information page is below.
This has been discussed numerous times on these threads:
Portable Gnumeric is one of the apps I have done and awaiting release. I'll be releasing more when I get back from CA. (I can post from here, but releases are tough)
Sometimes, the impossible can become possible, if you're awesome!