Use ProntoEdit 4.3 available from the files section. There's also a user's guide there that you can download.

Then, simply add an IR code to a button and click the 'RC5/6' button in the dialogs to be presented with another dialog where you select RC5.

Choose RC5 then enter the System and Command values you get from the Word Doc.

Even if someone gives you a file, that won't be good enough as you will still need to know how to 'merge' that content with your own. So, as a head start, I suggest you pick up the latest version of ProntoEdit from the files section for review.

There is also an FAQ (see link at bottom of the page) that will help get you started as well.