#19 set the "open with" easily

[vz33]

Can gentoo add the feature that open with other programs which have been installed in system?

For example, I want to open the html with firefox or chrome, how to set it easily? Inaddition, becausethere are many file types gentoo doesnot include, it is not convenient to set it for every file types.
Can gentoo call the gnome's open mode directly?
Thank you.