.MKV files don't work properly with WMP?

@Bree: Astude catch! I must admit I've never liked WMP for it's sluggishness and lack of functionality so I am partially biased.
Also I "stream" my media from my PC (which essentially is my main mediacenter for both music and video) with HDMI to my TV by switching monitors and have an external Audio Interface which is connected tot my hifi system so never bothered to look for alternative native solutions.

Still, thanks for pointing out this functionality.

Spiritos said:

...thanks for pointing out this functionality.

It's how I used to stream media in Win7, it allows you to browse for and pull media from the media server using just the display device (a smartTV in my case). Since the upgrade to Win10 I've turned it off, preferring to push media to my TV from the PC using 'Cast to...' in Explorer.

Bree said:

...to my TV from the PC using 'Cast to...' in Explorer.

Didn't know about this functionality but just looked it up. Sounds easy enough (just one click and there you go). I use (Win key + P) to switch my entire desktop (or sometimes extend if someone is watching a movie and I want to continue working on the PC) and actually chose for this way since other methods like using NVidia's tools and more gave me problems with the different aspect ratios of my monitor and TV (16:9 vs 16:10) and sound running through my Home Cinema Set.

I might give this a try someday soon as it does save one or two mouseclicks (but does force me to physically walk to my PC when for e.g. streaming the next epsiode in a binge mode ). However I don't think MPC-HC or VLC will adapt this functionality soon and I am very particular about the video quality which imo is the best with MPC_HC.

Anyway, once again thanks for pointing out this functionality. Was about to look for some options to stream to my iPhone and also for a simple and cheap (free?) Remote Access to Desktop iOS app and it seems Win10 has more under it's hood than I gave it credit for.

Spiritos said:

...(but does force me to physically walk to my PC when for e.g. streaming the next epsiode in a binge mode ). .. it seems Win10 has more under it's hood than I gave it credit for.

...and one final bit - you only have to walk to your PC the once. You can 'Cast to...' all your episodes in one go and they will be in the queue to play one after the other. (Yes, I binge too on occasion...) :)

Bree said:

...You can 'Cast to...' all your episodes in one go a..:)

And one last final note from me (before we completely derail this topic (still open to questions/support for OP though!). With premeditated binge watching you're absolutely right but I'm a relentess cinephile and have days where I follow my flow in watching movies 24/7 so I'd still have to get up from that very very comfy couch

But to tackle that I will look into the remote desktop options. So far none were to my satisfaction but you inspired some new ideas for which I will open a new topic should the need arise since that would feel more appropiate.

GL to you!
@Gelbs: Did you figure it out yet?

MKV is not supported by Windows Media Player. You must install MKV codec for WMP to make it work. Use other codecs, like ffmepg (vlc is using) if media play codec pack is useless. But if it is still not working, you'd better find a new player.

I solved this long ago by abandoning WMP and moving to K-Lite.
It plays everything.
On XP. On 7. On 10.