Windows 7 WMF + h.264 support issues

[obviousjim]

CLOUDS h.264 files that run fine on windows 8 but won't play on windows 7. I've tracked it down to a problem that seems similar to this.

On some Windows 7 the PlayerEvent comes back with a Codec Error (0xc00d5212 / MF_E_TOPO_CODEC_NOT_FOUND) ON - when it's loading the media, the width and height come in as 0 from MFGetAttributeSize, which returns error 0xc00d36e6.