The xls is the old format for Excel documetns. The later versions Excel 2010 and 2013 use the xlsx format, which is basically a compressed OpenXml based document. If you really want to see it then download Open XML SDK 2.5 application - http://www.microsoft.com/en-us/download ... x?id=30425 and open the document.
In this case you have to use Excel 2010/2013. Import the old xls file and save it as an xlsx-file. I am not saying you can import the file in Nav 2013 R2 but it is a good start.
Eric Beran
Software Design Engineer II Dynamics NAV Office 365 Microsoft
This posting is provided "AS IS" with no warranties, and confers no rights.
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In this case you have to use Excel 2010/2013. Import the old xls file and save it as an xlsx-file. I am not saying you can import the file in Nav 2013 R2 but it is a good start.
Software Design Engineer II
Dynamics NAV Office 365
Microsoft
This posting is provided "AS IS" with no warranties, and confers no rights.
Vjeko helped me with the code.
http://vjeko.com/blog/excel-interoperab ... n-nav-2013