[Solved] Remove app from right click context menu in Thunar

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http://crunchbanglinux.org – I know how to add an app to the open with context menu in Thunar but I can't figure out how to remove apps.If  I do right click > open with > open with other application > right click on app I get a remove option but it is canceled out / inactive / unavailable (not sure what the word is).Can someone tell me how to keep items from showing up on this list? (HowTos)