Windows 'open with' launches new document only

[Google Code Exporter]

What steps will reproduce the problem?
1. Associate .ep with pencil.exe
2. Try to open a .ep file by double clicking on it in explorer

What is the expected output? What do you see instead?
It should open the .ep file that was clicked on. Instead it shows a new 
document.

This means that to open a document, it must be done through the 'Open...' menu 
in Pencil, which can be quite cumbersome when you have a folder full of .ep 
files that you'd like to tweak!

What version of the product are you using? On what operating system?
2.0.5 and Windows 8.1

Original issue reported on code.google.com by [e-mail] on 9 Apr 2014 at 9:44