Mac OS X: Magic Launch lets you choose the way your Mac opens files, letting you not only enforce defaults for certain file types but set rules to exert complete control over the way your files work on your computer.
You could use Magic Launch to simply override those annoying moments when a file type's default app gets reset to some new application you installed (I'm looking at you, Adobe), but it can do so much more than that. The most exciting functionality provided by Magic Launch is the ability to write your own launch rules.
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One additional feature worth mentioning is that Magic Launcher can execute shell commands. If you want to open certain files in the command line or an X11 app, this can be particularly useful.
Magic Launch is available now for $US13 and provides a free trial. While we generally prefer to recommend utilities that fall under the cheap-to-free category, Magic Launch is a perfect solution to a frequently annoying problem. If you're frustrated with the way your Mac handles files for you and want to take back control, it's worth the cost.