If you tell me what you're trying to play, I can help you set them up as the default. Windows Media Player Legacy - Microsoft Support
: Select Custom settings to manually choose privacy options and media library locations. Set as Default : Go to Settings > Apps > Default apps . Find Music player or Video player . Select Windows Media Player from the list. Setup Of Windows Media Player 12
: On first launch, choose Recommended settings to automatically set it as the default for supported formats. If you tell me what you're trying to