How to open an .xlf file in Studio 2014

I am admittedly at a beginner level as a PM. I have Studio 2014, and a translator sent me a file in .xlf format, when we request all bilingual files be in .sdlxliff format. I know I should be able to open it in Trados, but when I try to, the file is not even recognized as a file that could be opened in Trados. Can someone please give me instructions aimed at a beginner?

thanks!

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