Allow FC-gui to "open With" (filename.ext)

```

(I could not find any USER command-line documentation.)

I would like the option to open (and/or run with check) the CLI from the O/S
file manager.

I use Calibre Open with plugin to edit EPUB files with Sigil. It would be cool
to just run FC.

Default Open FC with the filepath preset in the CLI
Options:
run (and wait for user action)
run and close, return pass/fail value
```

Original issue reported on code.google.com by `dragonsc...@sonic.net` on 26 Mar 2011 at 4:01

No files, tests, or entry points are named. Start by locating how FC-gui and the CLI currently accept file paths, then determine how an operating-system “Open With” action and the requested run, wait, close, and pass/fail behaviors should be represented; done means the documented invocation works from a file manager.

Written by the indexing model from the issue text.