I am attempting to save files through a MACRO as .xlsx files using
getclosefilename function. I have Excell 2007 set to save all files as .xls
files. When I save the files, it places the .xlsx extension, but saves in
..xls format. I cannot open the files as they are, but can after changing the
extension to .xls through Explorer they open just fine.

How do I set Excel 2007to save files as .xlsx through the MACR VBA?