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RM 2 Matroska Free Convert, as its name, is free and can be used to convert RM to Matroska. It is a good program for you if you want to convert RM to Matroska accidently. It can convert at superfast speed and the converting result is relatively good. The interface is really simple, so it's easy-to-use. You can master it even without any help. It is a professional RM to Matroska converter. Just try it.