Every application (that I know) uses Ctrl-Tab to switch between open files. For the longest time I couldn’t figure out how to switch between sheets in Excel (Microsoft Excel for the uninitiated!) (and don’t ask me why I didn’t Google it!) – and lo behold the other day I was given the ultimate gyaan – its Ctrl-PageUp and Ctrl-PageDown for Excel!!!
Of course – why should Microsoft comply with the rest of the world? (or even themselves!)