Where does Windows store its “Open With” settings?

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Take a look in:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\

and the sub-key of that is the extension you reassigned. Under that there will be the UserChoice and OpenWithList sub-keys which will contain your redefinition.

You may also want to read http://support.microsoft.com/kb/950505 which talks about your issue.

Update

As of Windows 8, life has gotten far more complicated. To create an extension association a custom hash needs to get calculated.

Fortunately, someone has reverse engineered the process and created a PowerShell script to do this without having to go through any GUI.

You can find it at the following GitHub link:

https://github.com/DanysysTeam/PS-SFTA

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