Hi JujiPL,
Welcome here!
You need to build a class to implement ISequentialStream if you want to use it.
Just use it as a normal dll file as you like.
Note: You must not use it as the type of data if the function or interface will interactive with other dll or UI. Because it is not a WinRT type. And if you use it without c++, maybe system.xml is more suitable than it.
Regards!
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