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.
I have a document that has a Visio file embedded within a tab in Excel. This works fine. MIcrosoft even makes it easy to edit the Visio document. I just double click and it opens right up. It's great.
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