Hey Kenny, How are you setting the default player??
You can try this if it's different than what you have tried. Hope this works.

While in Limewire go to Library. Now click Explore, in lower left corner. This will take you to your saved/shared folder outside of Limewire. Now Right click any file. Highlight Open With. Now go to choose VLC and click Always use Program to open.... and click OK.

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