Re: [PATCH 0/2] MR7417: mfplat: Modify MFCreateWaveFormatExFromMFMediaType to allow MF_MT_AM_FORMAT_TYPE to be missing or set to GUID_NULL.

[Brendan McGrath (＠redmcg)]

> Do we know what should happen if MT_AM_FORMAT_TYPE is used with non-zero GUID value?

Sorry, I realise my previous answer doesn't really answer the question. If there's not already a test I'll add one. But I suspect it should fail (as the function returns a `WAVEFORMATEX`, which doesn't support anything but `GUID_NULL` or `WAVEFORMATEX`).

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7417#note_95939