Quote:
Originally Posted by Mosu
The option only affects the MIME type of newly added attachments, not of existing attachments.
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True, disregard that comment of mine. Not only the implementation would be non-trivial for you, this would also mean, for consisntency, that the mime types of existing attachments should be auto-updated in the reverse way too when MKV is transmuxed, and most users probably don't expect/want that.
(Users of v58 may want to fix the broken mime types due to libmagic, but they can do so by re-muxing instead of transmuxing.)