Opening any file with any other Program

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http://askubuntu.com – Okay, I have the following problem: I have a file (.jnlp, but that isn't important) that I want to open with a certain program (javaws). Problem is that the program I want to open it with is not diosplayed in the list of programs when selecting Open with in the right-click menu. Is there any way to simply browse files as is possible in windows? Or perhaps a certain command I could use? Thanks in advance, Zarnaik (HowTos)