The title and file extension suggest this is a digital recording (track #26) from a collection of his works.
His albums are available for high-quality streaming or digital purchase, often published under his own label, Bleisch Urs . Piano Waves – Song by Key - Apple Music Bleisch - 26 Kleiner Irrtum.mp4
If you are looking for more pieces in this style, you can find his work on major streaming platforms: The title and file extension suggest this is