Let Win 7 built-in WMP12 without any software to smoothly load the external srt subtitles

Click the right button on the video playback interface and find that there is an option such as [Lyrics and Subtitles]. After expansion, the default is [Off] status. After selecting [On (if available)], close the player and replay the video.
After spending more than 10 minutes, I finally found the key to the problem. It was very simple, but it was a bit strange. Go to "Tools" - "Options", switch to the "Security" tab, and select the option in the red box below.

Let WMP12 display external subtitles, just check "If you provide local language subtitles, please display them" in the "Security" option, you don't need to convert the format, and you don't need a third party. tool.