Ever had problems with it?
Today I faced the ultimate in these regards: I even had a .wmv, but THE THING would not cooperate. No, sir: It kept on telling me that the codecs whatever.
Oh, well, Google comes, Google goes, and I found something of interest that came from the own Microsoft (yes, sometimes it works as it should! MS). Shame it did not work as they said it would, so that I went to the page they told me to visit, for third parties' CODECS, and downloaded absolutely everything that seemed to be even remotely related to my problem. I then installed everything, even something with the Communist flag on it, with no fear (what we should never do), and..., and...: Yes, that's right, FABULOUS OLD NOTHING!
I finally dug to the right side of the Google Universe and found a gem, which I should only tell you about in exchange for a few thousands, but, given my existential situation, going on for so long (more than fourteen years), I decided to give it away: All, second choice, XP Codec Pack, and, if your problems are of the same type, you should be just fine (the MS message was install codec or Apple product x).