"choose_file" as a file name doesn't pop up a choose file dialog

Eval the following job:
```js
new Job({
    name: "job2",
    do_list: [
    	Dexter.draw_dxf({}),
		]
	})
	```
Notice the error: 
The result of evaling JS  new Job({...  is...
ReferenceError: choose_file is not defined

In the past, that would have popped up a dialog box with which to select a new file. 