I am not sure how myself. You can probably try pming nukuv for the information on how he did it. He also releases the source code with each update of his in his journal pages. The journal page also has links to the the Inform 7 program the he is used to update the game. Haven't messed with myself so I don't know how hard it is to use.
Here are some links from his journal.
http://inform7.com/download/ inform7 program
http://www.scworlds.net/FI/FI.zip this is the current updates source code and it includes the latest release as well.
Hope this helps.