Question: how to add a srt file in windows media player?
Answer: The first step is to make sure that the video file and its subtitle file feature the exact same name. ... 
Once done, open Windows Media Player and in the Library Mode, go to Play->Lyrics, captions, and subtitles and click on “On if available“. ... 
Then, download the DirectVobSub (VSFilter) codec and install it on your PC.