This may be a wishlist item, not a bug, depending on what is supposed to be already working in Do. :-)
I have a very frequent use case for Do which goes something like this:
1) Activate Do
2) Start typing until I've identified a file (in my case almost always a Komodo project file, such as 'project.kpf'.
3) Now I want to open it with Komodo.
The problem is that no matter how often I do this, Do never seems to learn that when I have a file with extension .kpf open, I want to open it with Komodo. It always defaults to the action "open". When I choose "open with", it defaults to opening it with Firefox. Even for specific kpf files, it never seems to update its guess as to what I want to do with the file.
I would love it if Do would learn what action I am likely to want to perform with a given file. Even better would be if it would look at file extensions and start guessing that I want to treat all files with the same extension the same way.
If you replace 'file extension' with 'mime type', then yes. That would
be good.
I believe this is planned in the overhaul of the relevance engine that
should happen post-0.8.1.