Dot files as created by graphviz should have a mimetype. Not sure how best to call it, in kde3 we didn't have a proper name for it (the mimetype was defined by kgraphviewer so it was called application/kgraphviewer, let's forget about name;) Thanks for adding the mimetype.
Hmm, I just realize that .dot files are also msword templates, we need a mimetype for each, with *.dot as a pattern for each, and magic to differenciate them...
Bug #15363 has patch + testcase. *** This bug has been marked as a duplicate of bug 15363 ***
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