Unble to rename Test results (.trx) generated from VSTest.console.exe

I am trying to set name and file location for my Test results (.trx) generated from VSTest.Console.exe from console line but looks like its not working.

Below Command works fine, "c:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe" "MyTest.dll" /UseVsixExtensions:"true" /InIsolation /Logger:"trx"

But this one does not,

"c:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe" "MyTest.dll" /UseVsixExtensions:"true" /InIsolation /Logger:"C:\UnitTest\MyResults.trx"