Plex Documentation
→ Windows & Mac Desktop (Plex for Windows & Mac)
→ Plex Media Player
→ Plex HTPC
Plex for Windows is supported and receiving updates. It was last updated December 8, 2021.
Plex Media Player is no longer receiving updates. It was last updated May 19, 2020.
Plex HTPC is the replacement for Plex Media Player.
All three support HD audio passthrough via HDMI (dts-HD MA & TrueHD).
Unsure about using analog audio outputs from PC (never tried it).
In Plex for Windows, go to Settings → Player
Select the audio device.
Change Audio Device Kind to HDMI.
Passthrough options will then be available.
Example from my PC. VL260M is a TV I used for a monitor. It is connected via HDMI to a Nvidia GTX 750 Ti video card in my PC.
