So far, I have talked about the advantages of picking up open-source software over other Photoshop alternatives. If I've convinced you, let’s go over a couple of tools that you should consider. GIMP ...

Paste the PhotoShop.dll file into the FileTypes subfolder. Launch Paint.NET. With the plugin installed, you should be able to open PSD files without any problems.

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The "open" program is specific to OS X and lets you basically drag and drop a file with the -a command onto an application. This way it overrides the per-user OBJ open-with settings.