Play Recordings On Windows
From MythTV Official Wiki
Introduction
Once MythTV has been setup there are a few options to allow playback of TV recordings from the Windows platform.
Options
[mythweb mythweb] using the experimental flashplayer feature
MythTv Player - MythTv Player is a free and simple Myth client and player for Windows.
XBMC Xbox media center is now available on windows, and can play recordings and live tv.
Tapeworm - TapeWorm is a "parasitic" Windows front end for MythTV
Media Player Classic Homecinema used with mythrename.pl and samba