How to convert the Dual Language RMVB to 1 Language AVI

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Hi,2 ]! t, Y8 X( x( I6 F
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Anyone know what software can I use to convert the 2 language RMVB to 1 language AVI?7 T* _  l/ y& E" u

1 L" Q0 z( E  E! a- `$ iThank you very much