Research CODECs on google but don't install any until you are sure you are getting the one needed for the file that didn't play. There is also a new issue with MIDI in Vista. Look into that as well. As we don't have access to the dead file we can't look at the source of the issue.
I have many Powerpoint files of pictures with music that friends have sent me over the years. In my prior versions of Windows (98SE and 2000) when I double click on the files they will start and the music will also start at the same time. The music in all files will play.
I got a new computer with Windows Vista Home Premium and now the files will open, the pictures will advance, but the music will only play in some files while in most files it will not play. I downloaded and installed Windows Office 2007 Home and Student Version. I also downloaded the 2007 Microsoft PowerPoint Viewer. Neither of these made a difference.
I suspect the problem may be that MS Media Player is not well configured. Any ideas? Thank you in advance.