Here are two files. One can be open and the other can't. Maybe both of them can't be open. Please try both. If both of them can be open, then please use the first one.
Here are two files that one can be opened while the other can not, or it is also possible to open both files. Please try and see which can be opened ^^ If both files are able to be opened, please use the first one.
Here are two files. The first file is able to open and the second file is not be able to open; or may be both files are able to open. Please try them all. If both files can be opened, please use the first file.