I found this thanks to Scott in another thread. It worked for me:

"Start menu
Type "command" in the search box
Then right click on "Command Prompt" as is now shown above in the menu
and select "Run as Administrator"

In the command window type

assoc .zip=CompressedFolder

That will restore .zip files to their original Windows Explorer
associations."


"Stu" wrote:

> I have accidentally associate zip files to 'open with' the media player. When
> I try to reassociate zip files with the extraction program, the option is not
> available. I cannot right-click either and choose extract.
> How do I reassociate?