Before I installed the K-Lite Codec Pack 6.6.0 Basic MS PowerPoint would add and play my embedded MP3 audio files just fine. Also, YouTube videos ran with no problem.
I've heard of (and even sometimes used) video players like VLC when Windows Media Player prompts me to download "new codecs", but I've also heard people talk about codec packs like K-Lite, Shark007, ...
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