Step 1 - Save smi File
Once you have processed your video through SyncWords, open the Project Page and scroll down to the Select Output File Types section and check off and download a .smi file, the most compatible file type with Windows Media Player. See the Create a New Project and How to Output Captions on how to upload your media, customize your caption style, and save files to your local disc.
Step 2 - Save in the Same Directory
Save your caption file in the same folder as your video. SyncWords will automatically name your caption file after the media that you uploaded, but ensure that both the media file and the caption file have the same root name, otherwise Windows Media Player will not recognize that the captions are associated with that video.
Step 3 - Turn on Captions in WMP