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I have a Java program that runs on Linux, and from within the program, I want to open files (e.g. PDF files) with the system's native viewer. There are various programs available for this purpose: gnome-open, gvfs-open, xdg-open, ... Which one(s) should I use to cover as many Linux distributions as possible?

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xdg-open is the safest bet. Not everyone will necessarily have gnome or gvfs installed. xdg-open, on the other hand, is not tied to any desktop environment or toolkit.

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