From which website i get .smt themes?

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Hello friends, I got my samsung wave phone recently. I download some themes from some websites it have a file extension .sis but my phone didn't support .sis themes. My phone already have default theme with the file extension .smt After i search for .smt themes, but i didn't get good site to download it. Any one knows about where to get .smt themes or which file extension samsung wave accept.