Excel 2007 and DT in 64 Bit SW

Hi, just wondering if anyone has come across this....;

I am using SW 2008 (64 bit) and office 2007. My DT has nearly 1000columns and I am trying to save a copy of the DT so I can insert itinto a new model, but I get a warning from Excel saying"significant loss of functionality" because 2003 was limited to 256columns? Does SW interface with the new 2007 Excel? It will onlylet me insert the .xls files and not the .xlsx file?

If anyone has an idea about this I'd be happy to hear aboutit!SolidworksConfigurations design Tables