I'm continually bewildered by some of Excel's design choices. You can't have two files with the same filename open at the same time even if the files are in dif

I'm continually bewildered by some of Excel's design choices. You can't have two files with the same filename open at the same time even if the files are in different directories. And you can't, for some reason, save to a path with square brackets in it. (You can save it with round brackets, rename the file, and then load the file perfectly fine, though.)