I use Excel sometimes to gather information using built in VBA possibilities. It saves me a ton of code if I make the VBA macro run at execution of the file. The problem is that I want to read this macro enabled file which is a ".xlsm" to add the results to an array. But MS tells me that the file is not an Excel file.
So, my suggestion is to add ".xlsm" to the supported Excel file types. As far as I can tell there's not a big difference between the ".xls" and ".xlsm" but I'm no expert. I hope it's an "easy" feature to add.... I need it!

EDIT: I have looked around and it seems that macro enabled xls (xlsm) is not the same as xls, so the request I have might not be possible.