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I have "View > Show Updates from Repository" enabled, and it's mildly annoying that files added on the server have a generic document icon; it makes glancing at the icon to infer what type it is rather useless. Using -[NSWorkspace iconForFileType:] (rather than -iconForFile:) it's trivial to get an icon using just a file extension. Since you're displaying only the standard icon (rather than a preview icon for images, etc.) you could even cache icons in an application-static dictionary (keyed by file extension) to reduce memory use and make lookups really fast. (I have no idea how you're implementing it now, just an idea.)
Thanks, - Quinn
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