从你提供的link来看，对于Raw图片的支持是有限的：
Microsoft has developed a set of native metadata providers for exchangeable image file (EXIF), International Press Telecommunications Council (IPTC), and Extensible Metadata Platform (XMP) metadata that are currently invoked only for TIFF and JPEG containers. However,
the codec author is responsible for configuring this properly.
For RAW files that are not based on a TIFF container, it might be necessary to implement EXIF, IPTC, or XMP writers because the built-in readers and writers expect the data to conform to EXIF, IPTC, and XMP on-disk layout specifications. Codec authors can
also implement their own providers for any custom metadat
所以看上去您的RAW图片需要Codec Vendor实现了相应的WIC的支持才行
Best Regards,
Han Xia
