O Windows Media Player não pode alternar para o modo Tela Inteira. Talvez você precise ajustar as configurações de vídeo do Windows. Abras as configurações de vídeo no Painel de Controle e tente definir a Aceleração de hardware como Total.

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Windows Media Player cannot switch to Full Screen. You might need to adjust your Windows display settings. Open display settings in Control Panel, and then try setting Hardware acceleration to Full.

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