Excel 2007 does not support excel 2013 workbook saves

I have a template that can be opened with 2007, 2010 and 2013 versions of excel.  

If a user with excel 2013 opens the template than saves it as a workbook somewhere else I can no longer open the file using excel 2007.  I receive an unreadable error (see attachment).  

Excel 2010 can open the file.  And if excel 2010 user hits save the file can than be opened by office 2007...

However any saves done with 2013 make it unreadable once again unless I go into excel 2010 and hit "save".  

Anyone know if there are any support issues between 2013 and 2007?
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DougApplication Development ManagerCommented:
Here's a blog article that references your issue.  Maybe this will help:

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DougApplication Development ManagerCommented:
Have you also tried to open the file as an administrator (hold shift & right click on the file).  This could show if it's a security issue.  

Does this happen with new, blank workbooks?  Are there recorded macros or custom code in the files?

Also, the user running 2013 should make sure they are saving the file as an .xls workbook instead of .xlsx
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