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Graph returning incorrect MIME type for MKV video files

Hello everyone,

I am a maintainer for a small open source application that uses the Microsoft Graph API to interact with OneDrive. Recently it stopped working correctly for some file types. After some quick debugging it seems that Microsoft Graph now returns application/octet-stream as mimetype of an MKV file instead of video/x-matroska. mp4 containers seem to be unaffected and still return video/mp4. I had a quick look at the changelog and can't find such change.

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Outside of your code/app, do you repro the same behavior with POSTMAN/Graph Explorer as well?

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yes, I can reproduce it with graph explorer as well

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Any updates on this?

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