Windows 7 already has built in DivX support in the current beta. Hidden inside the various changes since beta for the RC is a change to Windows Media Player to natively support the .mov files. Yeah, ...

MOV is not one file format but rather a format envelope that can be made up of any of dozens of codecs, resolutions, and frame rates from basic DV through H.264, HEVC to ProRes, and other pro formats.