Today, I can no longer open any of my excel files with Excel, no matter the method (double-clicking, opening from the recently saved, from within the program, from the recovery windows, etc.) All my files can be opened with Calc, no problem. Last night the system had a windows update upon closing. This is Excel 2010 on a Japanese Windows 7.Kaspersky Internet Security for Mac and Kaspersky Total Security for Mac in particular can sometimes conflict with apps and for those on enterprise networks, we also recommend uninstalling Kaspersky Network Agent and Kaspersky Endpoint Security if you’re running them and then try opening Office 2016 on Mac again.