Open File In is a package for opening the current file in the application of your choice.
apm install open-file-in or search for it in the package manager.
Press Ctrl+Alt+O and pick the application of choice.
A comma separated list without spaces of applications you want to be able to trigger.
Default: GIMP, Inkscape, svgTester
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.