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hey jack,
I agree with justin. the best way is to create a client program on your customer's server. I've never tried it, but I'm pretty sure you could grab the source code of that file using CURL. And load it into a textbox, or display it into a div's innerhtml. Depending on the level of customization, you could easily use javascript to change predefined sections of the code and update the div innerhtml.
after your done, you could pass the entire page code back to a script on the clients server(using curl, or ajax), who's sole purpose is to take the the provided code and overwrite the existing file. Obviously you'll want to add some security to this script, like a authentication string or something.
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