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Well understood, thank you!
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I use a Macbook Pro running El Capitan.<br />
<br />
Whenever I press the spacebar in Finder while an audio or video file is selected, the file is played in a floating window.<br />
<br />
This is normal, of course. What I want to ask is, which Mac app runs when I do this?<br />
<br />
Thanks.
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I use a Macbook Pro running El Capitan.

Whenever I press the spacebar in Finder while an audio or video file is selected, the file is played in a floating window.

This is normal, of course. What I want to ask is, which Mac app runs when I do this?

Thanks.

Which Mac app runs?

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.