.tsperf files cannot be opened on their own. They simply hold the data seen in the different Performance views.
Your best option is to create a Test List and set the Test List Type to Performance. Include the desired tests to profile and execute.
After executing the Test List you are taken to the Results tab. Click the stopwatch icon in the upper right to view performance results. Now you can use the Word and Excel options in the Export ribbon to send data to an external file.
Note: Currently the export feature for Performance run results is not working as expected. I have filed a bug on this and alerted the appropriate developer. You can track the PITS Issue here: Public URL.
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