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What exactly is the DC reference parameter for GetWinMetaFileBits ()?

I got the impression that the classic Win16 metafiles do not have built-in size or resolution information (if there is no header METAFILEPICTor the like) - what does the GetWinMetaFileBits()reference DC use for?

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It is well documented in the SDK article:

This function converts an extended metafile to a Windows metafile so that its image can be displayed in an application that recognizes the old format.

The system uses a context reference device to determine the resolution of the converted metafile .

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