An x64 Windows edition will have msyuv.dll in both x86 and x64 versions. The x64 edition is in the System32 folder, the x86 version is in the SysWOW64 folder.
To get rid of the registrations of a codec, you generally have to remove it from 6 different registry keys. (Been there, done that...)
Glad that this wasn't caused by MPC-HC. I will add a pass-trough mode for the rarer Y'CbCr modes in the internal Base Video Filter. I already modified it quite a bit to better handle NV12 lately, anyway.
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