I have some complex excel files with Macros and references to other spreadsheets.

They are stored in a Sharepoint portal which exposes them to Excel online.

As soon as somebody opens them in online it breaks the external spreadsheet links and breaks some macros functions.

And since the macro doesn't work in Online would be great to have a slider, Block from Excel online. It would start to load online then see this flag make no changes and force local excel to open and download.