registry / regedit is a way to handle wine settings. That's not limited to winedmo. Though naming could be a bit better. I was trying to dig through it using ffmpeg as a filter, while the key is DisableGstByteStreamHandler. I.e. may be instead of negative it could be positive `UseFfmpeg...` or something..
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https://gitlab.winehq.org/wine/wine/-/merge_requests/6442#note_83281