Audio software  

I never used WMP or WMC often, just for testing or helping clients, and I have not started it in the last 18 months or so (until you mentioned it) , and had to search for it too.

I use other programs for media playback including VLC for Video and media-monkey for Audio, but to be honest I watch most of my PC based Media by streaming it to one of my Smart TVs or mobile devices. so use their interfaces. I use Mediamonkey to edit the meta-data of my media and for creating content for use in the Car ( currently the car has 3 dedicated 64GB Micro USBs )

Well I only use WMP for music CD's fr the car and friends either to prevent the original disk form getting damaged in the car or they want to try the music out.

I used to have one of those plug in fm modulators devices with sticks with music on an just tuned the radio to that device but it got really fiddly and thereafter I used it for books

DVD Fab media player w/passkey for video and AIMP3 for audio. The first combo works pretty much with all video file formats from the latest release to older file types. The latter plays everything audio and allows entering a variety of music stream web addresses as well as scrobbling last fm and spotify streaming among other goodies on board.

WMP, remember when it actually provided some sort of connection to the web? It has been left in the dust by just about any 3p app IMO. Just taking up valuable drive real estate.