How to set up ubuntu default double click action on a gdoc file to open its url in a web browser?

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http://askubuntu.com – I have an ubuntu vbox guest 10.04 running on win7 host. I set up vbox folder sharing so that I can access Google Drive set up on win7 host inside ubuntu vbox guest. All is well except that I can not double click to open gdoc file in a web browser to access that google document just as you would on Win7 machine. The Google doc content is in json format with url. I would think there is an easy way to config ubuntu to do so. Thanks in advance. (HowTos)