Save as v2007 explicitly?

[XL Pro]

In XL 2016:

Is there a VBA fileformat for saving an Excel file explicitly as ver 2007? I have a legacy program that can read an Excel 2007 xlsx file, but not 2016.

 

[MARK858]

As far as I know a xlsx filetype is the same in 2016 as 2007, are you sure that you weren't saving as an xls filetype when using 2007?

 

[shg]

The format is unchanged since Excel 2007, is it not?

 

[XL Pro]

Hmmm... we use a program (now pretty old) - Datawatch Monarch v10.5. It's capable of reading Excel files through v2007.
Our ERP creates Excel XML files, so in my macro I open them and then save them as true .XLSX files. If I save that file with Excel 2007, Monarch can read them. If I save them with Excel 2016, Monarch locks up.
I understand that .XLSX files are really just "zip" files, so if a file is saved from Excel 2016, there's probably information in there that Excel 2007 just ignores, but crashes Monarch.