Applies to: Microsoft Office Excel 2003, Microsoft Office Excel 2007, Excel 2010. From: MS.
This article describes how Microsoft Excel saves files.
When you save an existing file in Excel, Excel creates a temporary file in the destination folder that you specify in the Save As dialog box. The temporary file contains the whole contents of your workbook. If Excel successfully saves the temporary file, the temporary file is renamed with the file name you specify in the Save As dialog box.