XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.

The fact that the transition to Windows Vista is even slower than the initial expectation is reported in each direction, but as the transition is not rapidly progressed as well "Office 2007"there is.

Spreadsheets that contain complicated formulas and a lot of data can take a while to load when you open them in Excel 2007, but that's not the only reason spreadsheets can be slow to load. Microsoft ...