Around 30 years ago, CD was invented as a digital (PCM) format of 16 bits at 44.1 khz which at the time was thought to be "perfect sound forever". However, it turned out that theory did not work in practice, and 16/44.1 was found to be audibly inferior to higher resolution (24 bit) that made the sound smoother and less harsh sounding, and higher bitrate (96 khz or even 192 khz) that made it sound clearer and more transparent.
At the same time (1990s), Sony developed a different system with 1-bit resolution, but at a very high bitrate (2822.4 khz) that had certain advantages in creating cheap chips and using software to manipulate audio. They called this DSD, and all of the top albums on Sony-owned labels were released in DSD format (aka "SuperAudio CD", aka "SACD"). For, example, Miles Davis, Bob Dylan and The Rolling Stones albums were all released on SACD. SACD sounds perfectly transparent - I have heard master tapes in studios, and SACD sounds the same as the original master tape. (24/96 sounds great and you cannot notice the same problems as 16/44.1, but it just doesn't sound quite as transparent as SACD.)
But, in the end "earlier Sony" beat out "new Sony" - in other words, Sony's original CD specification of 16 bit and 44 khz of PCM, established PCM as a standard that could not be removed by the superior DSD.
So, now 24 bit and 96 khz is the standard for "high resolution audio" and is used on the audio of movies on Blu-Ray disc.
However, there are SACDs out there, and people want to play the better quality version when they listen to Miles or Dylan, and they want to have all their music on hard drive now. So, there are DSD ripping programs out there and foobar has a plugin to play them. There is more interest in this recently, because all the SACDs are out-of-print.
It occurred to me that a valuable - yet simple - MusicBee input plugin would be one that:
a) supports the file extension as an audio file that is part of the music library database,
b) starts an external player to play those files (in this case, foobar2000).
This might be ideal for some of these more obscure audiophile formats...