Trying to open SW2015 file in SW2014 doesn't warn "Future Version"

In another discussion a user uploaded a file and when I tried to open it I got an error message "An error was encountered while trying to open your file. Contact Technical Support for a possible solution." Later I found out they were using SW2015 and I am on SW2014, so that must be why the file didn't open. But I thought there was supposed to be an error message that says "Future version" or something. Did they forget this in 2015? Can someone try this out?

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