MPG won't play on a Mac

I'm new to Premier, so I'm sure you may need more information being diagnosing my problem. Basically, I have a project from which I exported an MPG file. The file appears to play fine on PC's, but on a Mac, my customer is getting "The movie is not in a format that QuickTime Player understands." Can anyone give me some suggestions on what might be the problem? Thank you...

Thanks Jeff. In this case, I should have mentioned that my customer is able to play other MPG files without any issue. In this particular case, I was editing an existing video - I simply deleted a scene and exported a new MPG. Client can play the original MPG, he just can't play the one I exported. Sorry - I should have mentioned that in the original post. Any idea why this might be the case, and what I could try to fix this?
I've read a lot about codecs recently btw - but I don't really understand how to identify what codec an existing file has - or what options I have when exporting. Might it be the codec I'm using that is incomptable with Macs?

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Message was edited by: K J
Message was edited by: K J

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MPG won't play on a Mac

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