henry hatsworth ds rom

Hi all. Whenever i have downloaded a rom in the past I select it from my download manager, unzip it then it is ready to put on r4 card. But this one I selected it from the download manager and it opened up windows media player
please help
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please help anyone i am new to this

What download manager? Just download the .rar file, extract with Winrar, and put it on your MicroSD.