Auvid Tuner UWP - trimming media files
(All About Windows Phone)

I suspect the use case for trimming audio and video files is somewhat niche, but still Auvid Tuner UWP might be a useful tool to keep up your sleeve. Perhaps making ringtones, video lopps/clips, and - yes - editing music track ID3 data (at least, if you pay the IAP). Screenshots and details below.