2 ways I know of
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1.
This works on windows computers as a standalone software in the opensource freeware realm.? It works alright on Win8.1.
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2. convert your files online via ZAMZAR
Upload and then get the converted file.?
CAUTION.? Anything copyrighted or private should NOT go thru any service like this.? Unknown if online convertors retain those files in a offline storage area for their own use.
BMaverick