There is no such thing as “Idiot/dummy” proof. People can get around anythings you put in their way in order to stop their stupidity.
This is not a DVD problem but how windows works. VLC and windows media player are version similar in the fact that they are not TRUE DVD software but get around it. VLC does a much better job. This is not knocking WMPlayer, but unless they client has it set up properly they in nothing you can add to your disc.
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“My software is idiot proof, the fact that you bought it proves that you are an idiot.” – Dogbert