Well, if you don't know what the extensions were, they could have been mp3 which is why they played in the media player without plugin problems.
Here's a page on getting a flac plugin for your windows media player if you don't decide to download foobar2000:
http://www.losslessaudioblog.com/?p=40 Sorry I can't help on the installation as I'm a Mac user.
No members have liked this post.