That's a Windows Media Player file. Microsoft dropped development of WMP for Mac long ago, but you may be able to use the free version of Flip4Mac. I know it works with Media Player's .wmv files. Work a try on the .wpl files.
F4M simply does a conversion to allow the Media Player files to run in QuickTime, which s already on your Mac.
There are some Microsoft codecs that won't run on Mac at all. Such is MS....
If F4M doesn;t work, try Googling "wpl mac." Ther appear to be other convertor out there.