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Because the MHTML format produced by Chromium can almost be considered as proprietary.

That's not correct. MHTML has been defined as internet standard since 1999. MHTML has been an internet standard since 1999, with support dating back to IE 5.0.

https://datatracker.ietf.org/doc/html/rfc2557

I'm actually referring to the "set of modifications" described here [1] and the fact that only Chromium can open (these) MHTML files today.

[1] https://docs.google.com/document/d/1FvmYUC0S0BkdkR7wZsg0hLdK...

Good to know that!

Are you meaning that these modifications cause the generated MHTML files to become non-standards-compliant?

I wouldn't consider them proprietary though. At least the primary software used to open these files, Chromium, is open-source software.

I agree that it's debatable, which is why I used the word “almost” ;). The fact remains that this info isn't in RFCs and is hard to find on the web.

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