You're correct, it does work that way. I've just never seen it with the extension after the variable. I would use .html?ID=1. It is the standard format, and you can block robot access a lot easier.
Disallow: /pagename.html?*
will allow robots to /pagename.html but block them for /pagename.html?ID=1
Search engines will only index one version of your page that way.
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