are the avx ymm registers saved in context structure?

Seems also okay with hotfix in user mode. Not sure why but there is also another library which handles these commands (specifically context) although slightly differently.

Code:

        ...
        invoke  RtlInitializeExtendedContext,Context,100040h,Chunk         ; Is chunk the right word?
        ...                                                                ; Returns 0 on success.

;----------------------------------------------
section '.idata' import data readable writeable
;===============================================

  library  xstate,'api-ms-win-core-xstate-l1-1-0.dll'

    import xstate,\
                RtlCopyExtendedContext,'RtlCopyExtendedContext',\
         RtlGetEnabledExtendedFeatures,'RtlGetEnabledExtendedFeatures',\
           RtlGetExtendedContextLength,'RtlGetExtendedContextLength',\
            RtlGetExtendedFeaturesMask,'RtlGetExtendedFeaturesMask',\
          RtlInitializeExtendedContext,'RtlInitializeExtendedContext',\
              RtlLocateExtendedFeature,'RtlLocateExtendedFeature',\
                RtlLocateLegacyContext,'RtlLocateLegacyContext ',\
            RtlSetExtendedFeaturesMask,'RtlSetExtendedFeaturesMask'