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I’m trying to programmatically check file associations by the file extension (for example .jnlp files). I keep reading that
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\JNLPFile\Shell\Open\Command
is the Registry key to check. However, if you change the association through Windows Explorer:
Open With > Choose Program > (Always use the selected program)
the change isn’t at all reflected in this Registry key. Where else is this information stored?
Take a look in:
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