Excel 2007 Problem.Please advise.
 

Have two excel files .xls that when I try to open in excel 2007 get error
"the file you are trying to open is different format, make sure file is not
corrupted ?? If I send the same excel file to a system that has office 2003
SP3, It opens it ok so the above error regarding file format is false. Have
SP1 for office 2007 and save in 97-2003 format checked. Please advise.