We have .xlsm file in document library. I know that .xlsm files with protection are not supported to view in Browser,due to this SharePoint shows small dialogue where it has 'Open In Excel' option. however,in our case for some documents this option is grayed out and for some of them its working as expected(Open In Excel option not grayed out).
has anyone face such issue or is there any way to enable the open in Excel button?