Windows Media Player 无法播放文件，因为未启用多播协议。请在“工具”菜单上单击“选项”，再单击“网络”选项卡，然后选择“多播”复选框。要获得其他帮助，请单击“Web 帮助”。

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Windows Media Player cannot play the file because the multicast protocol is not enabled. On the Tools menu, click Options, click the Network tab, and then select the Multicast check box. For additional assistance, click Web Help.

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