Can't use FArchiveFileWriterGeneric?

Development Programming & Scripting C++
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1

I find that FArchiveFileWriterGeneric is not marked with CORE_API,so I can’t use it in my codes.
but FArchiveFileReaderGeneric is marked.
It’s very strange.
Could someone tell me the reason?

2

CORE_API is still missing in 4.19
Need help !