I have never had any problem either.
Agree. It is not.
But according to this document page:
When a mail reader encounters mail with an unknown Content- type value, it should generally treat it as equivalent to "application/octet-stream", as described later in this document.
So it goes into greater detail about default behavior later in the document "somewhere".
But I would submit that the term "mail reader" should apply to any client application of whatever kind, ie, browser, etc.
For another example, see RFC 2077, which describes one of the newest main content types "model".
4. Encoding and Transport
a. Unrecognized subtypes of model should at a minimum be treated
In the future, when SketchUp "
.skp" and "
.skb" resources get their own registered content types / mime types / media types, they will be registered as vendor specific, under the model main type (not the application main type.)
I guess the "
.binary" is unneeded as RFC 2077 says binary format is assumed unless otherwise stated.
I would expect that the other non-model SketchUp file resources ("
.layout", etc.,) would have media types that begin with:
For more information on media types, see: