Change Omnibox Offer Priority in Chrome Extension

Question

I am writing a Google Chrome extension that will use the \\ keyword as an Omnibox trigger. This works well, and I achieve most of the desired result, except that Omnibox always offers file:// priority before offering my application.

I read about ways to change the priorities of Omnibox offers in my browser (manual selection from the keyboard, etc.). But is there any way to make changes to the extension code, so if the extension was deployed in any browser, \\ launches my extension before it prompts for file:// ?

Any help or push in the right direction is welcome.