Nevertheless, Enjoy
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1. Go to the Game Browser. For most people their should be Three Guildwars Entries (One per campaign) Though oddly the icons for prophecies and Nightfall disappeared right a few minutes before i started taking screenshots.
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2. Right Click on any of the Guildwars Icons. Since the rest disappeared, I'll be using Guildwars: Factions as my example. Then click on Customize
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3. Click on the second entry then click on Add.
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4. Tell the program the location of where you saved Guildwars. No need for an explanation. I'm confidant the image tag could be put right here but just to be on the safe side, i continued ahead without it.
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5. Name it. For the purpose of this guide, I have called it "-image" Though any name will work fine including "I pwn you" and "Wow Omg"
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6. Go back to the customize screen and click on your new image command. Then click on edit. The next screen should be familiar to most. Now insert your Image Command and your set.
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Congratulations =)
Though you do NOT need to do this for Vista and can just add on the image tag with any normal shortcut, this will help keep all your icons in the same place and puts everything in one nice neat central location.