Those are standard windows file formats for video and audio. You can open them in any app that plays those formats, but the default on a windows machine is usually windows media player. 
I'm guessing you're doing this from an apple/android/linux device in which case the files can either be sent to a windows device by email, usb, or over the network, or you can download an app from the app store.  
You can also go to the zoom app, click on meetings and choose recordings. 
If all else fails you can try zoom support.  
https://support.zoom.us/hc/en-us/articles/201362753-Local-Recording-Fails-To-Convert?mobile_site=true