The Case of the Missing Icons

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In a recent attempt to add some new filetype icons to SharePoint, I stumbled across an interesting problem... duplicate entries in the icon lookup file (...\12\TEMPLATE\XML\DOCICON.xml) cause icons to disappear, with the alt text "Item Icon" in their place. In my case, I added a Photoshop (.psd) icon for some of our designers. But, just like this guy, I quickly realized that SharePoint already has one. A duplicate entry will break icons in lots of places (search, for example), so edit with care.

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