ADDON EXCEL REPORTS & FORMATS
If you frequently share workbook data with people who use an earlier version of Excel, you can work in Compatibility Mode to prevent the loss of data and fidelity when the workbook is opened in the earlier version of Excel, or you can use converters that help you transition the data. For more information, see Save an Excel workbook for compatibility with earlier versions of Excel.
The .xlsx workbook format introduced in Excel 2007 preserves all worksheet and chart data, formatting, and other features available in earlier Excel versions, and the Macro-Enabled Workbook format (.xlsm) preserves macros and macro sheets in addition to those features.
If you save a workbook in another file format, such as a text file format, some of the formatting and data might be lost, and other features might not be supported.
