1. The first step is to make sure that the video file and its subtitle file feature the exact same name. Windows Media Player does not let you add subtitles manually and it only detects the subtitles when they have the same name as the video.
2. Once done, open Windows Media Player and in the Library Mode, go to Play->Lyrics, captions, and subtitles and click on “On if available“. You can also find this option in the Now Playing Mode by right clicking on the top.
Note: Some users report that subtitles started working after these steps, so you should play a video and check if subtitles are working in Windows Media Player. If not, just follow the steps below.
4. Once done, you will have to download and install Shark007’s Advanced codec for Windows Media Player. After it’s installed, open the 64bit Settings Application or 32bit Settings Application (Yes, that’s what it’s named), depending on your PC. You will have to launch it with administrator rights by right clicking on the application and clicking “Run as Administrator“.
5. When the application opens, go to the tabs of different video file types and check the option that says “disable Media Foundation for MP4/AVI/MKV etc..). Also, head to the “Swap” tab and check “disable Windows Media Foundation“.
After you are done with the aforementioned steps, you can just open a video file in Windows Media Player and you should see the subtitles working fine. If they still don’t work, there might be some problem with the subtitle file. In that case, try changing its file name from .srt to .sub. We have tested the process, so we are sure of its working.