Windows 7 file extension association

Question

I am referring specifically to windows 7.

I have code that associates a certain extension with my application as proposed by webJose on the following page: What registry

Answer 1

My solution was not to try to delete the UserChoice key (only administrators can do it), but to delete the key the ProgId is pointing to. If the user made a choice in the past the ProgId has a value like Applications\*.exe. The non-admin can delete the key in a batch:

REG DELETE HKCR\Applications\*.exe /f

This might be a bit of a hack, but worked for me.