using downloads on dsi console

can any one tell how to change .rar games to .sav and .nds extensions so the games can work on the dsi console

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https://www.romulation.org/forum/index.php?topic=1462.0Read this.You will also need a flash cart compatibile with a dsi, and winrar, that will be explained in the above link.

This is the WinRAR tutorial
https://www.romulation.org/forum/index.php?topic=3880.0