You can download Windows Media Player for the Mac. This will play the wmv screen recordings created by
My Screen Recorder Pro. Here is a link to the Windows Media Player download:
https://www.apple.com/downloads/macosx/video/windowsmediaplayerformacosx.html
Alternatively, you can also choose to record using the MP4 format, this file type will play directly in the Apple Quicktime Player. To change the recording type, click Tools >> Settings >> Format and select the MP4 profile.