Create Extension Entry for Unknown File via Context Menu

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I've altered my windows xp system so that when an unknown file is double

clicked, you DO NOT have the option to select "always use this program to

open this file type".

However, if I add a key to Hkey Classes Root, and name it with the three

letter extension, then all of a sudden I DO have the option to select

"always use this program for this file type".

So what I want to do, is add a context menu item to Unknown Files (I'd call

it "Associate"), that will:

1. create the three letter extension key in HKCR

2. then run the "open with" dialog for said extension

This may explain the details, but doesn't say how to automate 1 & 2 above


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