Todd Pederzani wrote:

Guessing/deciding non-standard MIME types on our own?  So if MIME searching doesn't totally replace the existing system, why make any new proposal more complex by including it?

Ok, then use the *nix program `file' - wich can easily be ported to any type of OS, or atleast with some if it's functions. And therefor using a shared magic.mime (a file that provides data to guess mime types) can easily be done - if that's the problem.
The current way to determine file types isn't pretty slick, so that's why (at least) I am trying to figure out a new one.
And all other suggestions for deciding filetype have been so far to have it being based on filextensions, wich is not the same!

Using a shared magic.mime may not be the best way, but atleast the best suggestion so far.

/Carl-Adam