Hi Atom, welcome to the forum.
Yes, I would delete the file you showed in the snap shot. However, place the new "S7S SoundSet 7.1a.xml" file into the Sounds folder, not the House Styles folder.
And then in your Playback Configuration you will want to have that sound set applied to your instance of Sibelius Player, like the image I attached.
Please let me know if you have any more questions.
Hugh
Yes, I would delete the file you showed in the snap shot. However, place the new "S7S SoundSet 7.1a.xml" file into the Sounds folder, not the House Styles folder.
And then in your Playback Configuration you will want to have that sound set applied to your instance of Sibelius Player, like the image I attached.
Please let me know if you have any more questions.
Hugh