For about a decade, Flip4Mac was the (free) way to go to play various Windows media files through QuickTime Player on a Macintosh. (AVIs, WMVs, ASFs, etc.)
But with MacOS 10.9, that link seems to have been broken, according to Apple:
Media formats supported by QuickTime Player - Apple Support
Problem: Flip4Mac is no longer "free". You must now pay for it.
Are there any free alternatives?
iMac, OS X Mavericks (10.9.5), late-2012 Core i5, 8GB RAM, 1 TB HD